{"product_id":"samsung-25r-18650","title":"Samsung 25R 18650 2500mAh 20A Battery","description":"\u003cstyle\u003e\n.s25r-desc{\n  --bs-black:#000;--bs-ink:#1f2328;--bs-gray:#f3f5f6;--bs-line:#d9dee3;--bs-orange:#ef6f07;\n  --samsung-green:#0b7f3a;--samsung-blue:#1428a0;--ok:#108a00;--warning:#ffb100;--danger:#c81825;\n  --white:#fff;--muted:#66707a;--radius:18px;--shadow:0 10px 30px rgba(0,0,0,.10);\n  max-width:1180px;margin:0 auto;padding:22px;color:var(--bs-ink);font-family:Arial,Helvetica,sans-serif;line-height:1.45;background:#fafafa;\n}\n.s25r-desc *{box-sizing:border-box;}\n.s25r-desc h1,.s25r-desc h2,.s25r-desc h3{line-height:1.12;margin:0 0 12px;letter-spacing:-.02em;}\n.s25r-desc p{margin:0 0 14px;}\n.s25r-desc .eyebrow{display:inline-flex;align-items:center;gap:8px;background:rgba(239,111,7,.12);color:var(--bs-orange);padding:7px 10px;border-radius:999px;font-weight:800;text-transform:uppercase;letter-spacing:.08em;font-size:12px;}\n.s25r-desc 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9px;border-radius:999px;font-size:12px;font-weight:800;letter-spacing:.04em;text-transform:uppercase;}\n.s25r-desc .badge.ok{background:#e9f7e8;color:var(--ok);} .s25r-desc .badge.warn{background:#fff3d6;color:#9a6800;} .s25r-desc .badge.info{background:#eaf2ff;color:var(--samsung-blue);} .s25r-desc .badge.danger{background:#fdecec;color:var(--danger);}\n.s25r-desc .note{margin-top:12px;padding:12px 14px;border-left:4px solid var(--bs-orange);background:#fff8f2;border-radius:10px;font-size:13px;}\n.s25r-desc .mini-card{background:var(--bs-gray);border:1px solid var(--bs-line);border-radius:16px;padding:16px;}\n.s25r-desc .formula{font-family:'Courier New',monospace;font-weight:700;background:#0f1113;color:#fff;padding:10px 12px;border-radius:10px;display:inline-block;}\n.s25r-desc .application-card{border:1px solid var(--bs-line);border-radius:18px;padding:18px;background:linear-gradient(180deg,#fff,#fbfbfb);}\n.s25r-desc .application-card h3{font-size:20px;}\n.s25r-desc .application-card ul{margin:0;padding-left:18px;}\n.s25r-desc .application-card li{margin:0 0 8px;}\n.s25r-desc .checklist{margin:0;padding-left:18px;}\n.s25r-desc .checklist li{margin:0 0 10px;}\n.s25r-desc .faq-item{border-top:1px solid var(--bs-line);padding:16px 0;}\n.s25r-desc .faq-item:first-child{border-top:none;padding-top:0;}\n.s25r-desc .faq-item h3{font-size:19px;margin-bottom:6px;}\n.s25r-desc .foot{font-size:12px;color:var(--muted);margin-top:12px;}\n@media(max-width:1000px){.s25r-desc .kpi-grid{grid-template-columns:repeat(3,1fr);} .s25r-desc .chart-grid,.s25r-desc .two-col,.s25r-desc .three-col{grid-template-columns:1fr;}}\n@media(max-width:640px){.s25r-desc{padding:14px;} .s25r-desc .hero{padding:24px;} .s25r-desc .kpi-grid{grid-template-columns:repeat(2,1fr);}}\n\u003c\/style\u003e\n\u003cdiv class=\"s25r-desc\"\u003e\n\u003csection class=\"hero\"\u003e\n\u003cdiv class=\"hero-grid\"\u003e\n\u003cdiv class=\"hero-copy\"\u003e\n\u003cspan class=\"eyebrow\"\u003e\u003cspan class=\"dot\"\u003e\u003c\/span\u003e product description\u003c\/span\u003e\n\u003ch1\u003e\n\u003cspan style=\"color: rgb(255, 255, 255);\"\u003eSamsung 25R 18650\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(255, 255, 255);\"\u003e2500mAh \/ 20A\u003c\/span\u003e\n\u003c\/h1\u003e\n\u003cp class=\"sub\"\u003eHigh-drain \u003cstrong\u003e2.5Ah 18650 lithium-ion power cell\u003c\/strong\u003e designed for applications that need proven Samsung SDI quality, a strong 20A continuous-discharge rating, compact 18650 compatibility, and a rugged performance profile for tools, lighting, RC systems, robotics, and custom packs.\u003c\/p\u003e\n\u003cdiv class=\"cta-row\"\u003e\n\u003cspan class=\"pill orange\"\u003e20A Continuous Discharge\u003c\/span\u003e \u003cspan class=\"pill green\"\u003e2500mAh Standard Capacity\u003c\/span\u003e \u003cspan class=\"pill blue\"\u003e2450mAh Rated @ 10A\u003c\/span\u003e \u003cspan class=\"pill\"\u003e4A Rated Charge\u003c\/span\u003e \u003cspan class=\"pill\"\u003e2.5V Cut-Off\u003c\/span\u003e \u003cspan class=\"pill\"\u003eUnprotected Flat Top\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"kpi-grid\"\u003e\n\u003cdiv class=\"kpi orange\"\u003e\n\u003cb\u003e20A\u003c\/b\u003e\u003csmall\u003eMax Continuous Discharge\u003c\/small\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"kpi green\"\u003e\n\u003cb\u003e2500mAh\u003c\/b\u003e\u003csmall\u003eStandard Capacity\u003c\/small\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"kpi blue\"\u003e\n\u003cb\u003e2450mAh\u003c\/b\u003e\u003csmall\u003eRated Capacity at 10A\u003c\/small\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"kpi black\"\u003e\n\u003cb\u003e4A\u003c\/b\u003e\u003csmall\u003eRated Charge Current\u003c\/small\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"kpi orange\"\u003e\n\u003cb\u003e≤18mΩ\u003c\/b\u003e\u003csmall\u003eAC Impedance Limit\u003c\/small\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"kpi green\"\u003e\n\u003cb\u003e18.4 × 65.0mm\u003c\/b\u003e\u003csmall\u003eMax Cell Envelope\u003c\/small\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003cdiv class=\"two-col\"\u003e\n\u003cdiv\u003e\n\u003ch2\u003eSamsung 25R 18650 2500mAh 20A Battery\u003c\/h2\u003e\n\u003cp\u003eThe Samsung INR18650-25R is one of the classic high-drain 18650 cells: moderate capacity, strong discharge current, predictable pack behavior, and broad compatibility with 18650-oriented systems. It is best used where current delivery matters more than maximum runtime per cell.\u003c\/p\u003e\n\u003cp class=\"muted\"\u003eFor engineering calculations, use \u003cstrong\u003e2500mAh standard discharge capacity\u003c\/strong\u003e, \u003cstrong\u003e2450mAh rated discharge capacity at 10A\u003c\/strong\u003e, \u003cstrong\u003e3.6V nominal voltage\u003c\/strong\u003e, and \u003cstrong\u003e20A maximum continuous discharge\u003c\/strong\u003e. \u003c\/p\u003e\n\u003cdiv class=\"note\"\u003e\n\u003cstrong\u003eDesign note:\u003c\/strong\u003e the simplified charts below are presentation-oriented visuals based on the published product specification and product listing. They are useful for shopper education and pack-planning, but not a substitute for validating the finished battery system under real current, temperature, and enclosure conditions.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ctable class=\"spec-table\" aria-label=\"Samsung 25R specification table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand \/ Model\u003c\/th\u003e\n\u003ctd\u003eSamsung SDI INR18650-25R\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCell Type\u003c\/th\u003e\n\u003ctd\u003e18650 cylindrical lithium-ion rechargeable cell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStandard Discharge Capacity\u003c\/th\u003e\n\u003ctd\u003eMinimum 2500mAh at 0.2C \/ 500mA discharge to 2.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRated Discharge Capacity\u003c\/th\u003e\n\u003ctd\u003eMinimum 2450mAh at 10A discharge to 2.5V after rated charge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNominal Voltage\u003c\/th\u003e\n\u003ctd\u003eSamsung specification: 3.6V; live retail listing: 3.7V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCharge Cut-Off Voltage\u003c\/th\u003e\n\u003ctd\u003e4.20V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDischarge Cut-Off Voltage\u003c\/th\u003e\n\u003ctd\u003e2.50V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStandard Charge Method\u003c\/th\u003e\n\u003ctd\u003e1.25A CC-CV to 4.20V, terminate at 125mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRated Charge Method\u003c\/th\u003e\n\u003ctd\u003e4A CC-CV to 4.20V, terminate at 100mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCharging Time\u003c\/th\u003e\n\u003ctd\u003eStandard charge approx. 180 minutes; rated charge approx. 62 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMax Continuous Discharge\u003c\/th\u003e\n\u003ctd\u003e20A at room temperature \u003cspan class=\"badge ok\"\u003ePrimary product rating\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePulse Discharge Reference\u003c\/th\u003e\n\u003ctd\u003e100A momentary pulse, less than 1 second, in Samsung characterization material\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInitial Impedance\u003c\/th\u003e\n\u003ctd\u003e≤18mΩ AC at 1kHz; ≤30mΩ DC reference in Samsung characterization material\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDimensions\u003c\/th\u003e\n\u003ctd\u003eHeight max 65.00mm; diameter max 18.40mm in product specification\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e45.0g max; characterization material shows ~43.8g typical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Temperature\u003c\/th\u003e\n\u003ctd\u003eCharge 0°C to 45°C; discharge -20°C to 60°C ambient\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStorage Temperature\u003c\/th\u003e\n\u003ctd\u003e1 year: 0–23°C; 3 months: 0–45°C; 1 month: 0–60°C at ex-factory status\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShipment Voltage\u003c\/th\u003e\n\u003ctd\u003e3.43V to 3.58V charging-voltage range\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eProtection\u003c\/th\u003e\n\u003ctd\u003eNo — unprotected bare cell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section dark\"\u003e\n\u003ch2\u003e\u003cspan style=\"color: rgb(255, 255, 255);\"\u003eElectrical operating envelope at a glance.\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"muted\"\u003eThese quick-reference visuals summarize how the 25R behaves in relation to current, voltage window, capacity-to-energy translation, and C-rate interpretation.\u003c\/p\u003e\n\u003cdiv class=\"chart-grid\"\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e1. Current Capability Stack\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eKey current reference points for standard charge, rated charge, rated capacity testing, continuous discharge, and momentary pulse characterization.\u003c\/p\u003e\n\u003csvg class=\"diagram\" viewbox=\"0 0 740 300\" role=\"img\" aria-label=\"Samsung 25R current capability stack chart\"\u003e\n          \u003crect x=\"78\" y=\"38\" width=\"74\" height=\"202\" fill=\"#5d6772\" rx=\"12\"\u003e\u003c\/rect\u003e\n          \u003crect x=\"202\" y=\"118\" width=\"74\" height=\"122\" fill=\"#0b7f3a\" rx=\"12\"\u003e\u003c\/rect\u003e\n          \u003crect x=\"326\" y=\"158\" width=\"74\" height=\"82\" fill=\"#ef6f07\" rx=\"12\"\u003e\u003c\/rect\u003e\n          \u003crect x=\"450\" y=\"207\" width=\"74\" height=\"33\" fill=\"#1428a0\" rx=\"12\"\u003e\u003c\/rect\u003e\n          \u003crect x=\"574\" y=\"225\" width=\"74\" height=\"15\" fill=\"#108a00\" rx=\"8\"\u003e\u003c\/rect\u003e\n          \u003cline x1=\"55\" y1=\"240\" x2=\"690\" y2=\"240\" stroke=\"#c9d0d7\" stroke-width=\"2\"\u003e\u003c\/line\u003e\n          \u003cline x1=\"62\" y1=\"240\" x2=\"62\" y2=\"36\" stroke=\"#c9d0d7\" stroke-width=\"2\"\u003e\u003c\/line\u003e\n          \u003ctext x=\"92\" y=\"258\" font-size=\"14\" fill=\"#1f2328\"\u003e100A\u003c\/text\u003e\n          \u003ctext x=\"218\" y=\"258\" font-size=\"14\" fill=\"#1f2328\"\u003e20A\u003c\/text\u003e\n          \u003ctext x=\"344\" y=\"258\" font-size=\"14\" fill=\"#1f2328\"\u003e10A\u003c\/text\u003e\n          \u003ctext x=\"470\" y=\"258\" font-size=\"14\" fill=\"#1f2328\"\u003e4A\u003c\/text\u003e\n          \u003ctext x=\"596\" y=\"258\" font-size=\"14\" fill=\"#1f2328\"\u003e1.25A\u003c\/text\u003e\n          \u003ctext x=\"72\" y=\"29\" font-size=\"14\" fill=\"#1f2328\" font-weight=\"700\"\u003ePulse \u0026lt;1s\u003c\/text\u003e\n          \u003ctext x=\"181\" y=\"108\" font-size=\"14\" fill=\"#1f2328\" font-weight=\"700\"\u003eContinuous discharge\u003c\/text\u003e\n          \u003ctext x=\"304\" y=\"148\" font-size=\"14\" fill=\"#1f2328\" font-weight=\"700\"\u003eRated test\u003c\/text\u003e\n          \u003ctext x=\"425\" y=\"198\" font-size=\"14\" fill=\"#1f2328\" font-weight=\"700\"\u003eRated charge\u003c\/text\u003e\n          \u003ctext x=\"540\" y=\"216\" font-size=\"14\" fill=\"#1f2328\" font-weight=\"700\"\u003eStandard charge\u003c\/text\u003e\n        \u003c\/svg\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e2. Voltage Operating Window\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eBasic per-cell voltage limits used for charger, BMS, and pack configuration.\u003c\/p\u003e\n\u003csvg class=\"diagram\" viewbox=\"0 0 640 250\" role=\"img\" aria-label=\"Samsung 25R voltage operating window diagram\"\u003e\n          \u003cline x1=\"50\" y1=\"125\" x2=\"590\" y2=\"125\" stroke=\"#ccd3da\" stroke-width=\"10\" stroke-linecap=\"round\"\u003e\u003c\/line\u003e\n          \u003cline x1=\"90\" y1=\"125\" x2=\"520\" y2=\"125\" stroke=\"#0b7f3a\" stroke-width=\"18\" stroke-linecap=\"round\"\u003e\u003c\/line\u003e\n          \u003ccircle cx=\"90\" cy=\"125\" r=\"16\" fill=\"#c81825\"\u003e\u003c\/circle\u003e\u003ccircle cx=\"520\" cy=\"125\" r=\"16\" fill=\"#108a00\"\u003e\u003c\/circle\u003e\n          \u003cline x1=\"90\" y1=\"70\" x2=\"90\" y2=\"178\" stroke=\"#c81825\" stroke-dasharray=\"6 6\"\u003e\u003c\/line\u003e\u003cline x1=\"520\" y1=\"70\" x2=\"520\" y2=\"178\" stroke=\"#108a00\" stroke-dasharray=\"6 6\"\u003e\u003c\/line\u003e\n          \u003ctext x=\"63\" y=\"55\" font-size=\"18\" font-weight=\"700\" fill=\"#c81825\"\u003e2.5V\u003c\/text\u003e\u003ctext x=\"476\" y=\"55\" font-size=\"18\" font-weight=\"700\" fill=\"#108a00\"\u003e4.2V\u003c\/text\u003e\n          \u003ctext x=\"110\" y=\"105\" font-size=\"18\" font-weight=\"700\" fill=\"#0b7f3a\"\u003eUsable operating band\u003c\/text\u003e\n          \u003ctext x=\"43\" y=\"201\" font-size=\"14\" fill=\"#1f2328\"\u003eDischarge cut-off\u003c\/text\u003e\u003ctext x=\"462\" y=\"201\" font-size=\"14\" fill=\"#1f2328\"\u003eCharge cut-off\u003c\/text\u003e\n          \u003ctext x=\"210\" y=\"160\" font-size=\"14\" fill=\"#66707a\"\u003eSpecification nominal voltage: 3.6V\u003c\/text\u003e\n        \u003c\/svg\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e3. Capacity and Energy Translation\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eApproximate nominal energy using Samsung’s 3.6V nominal-voltage specification.\u003c\/p\u003e\n\u003csvg class=\"diagram\" viewbox=\"0 0 620 132\" role=\"img\" aria-label=\"Samsung 25R energy formula diagram\"\u003e\n          \u003crect x=\"20\" y=\"24\" width=\"170\" height=\"84\" rx=\"16\" fill=\"#f3f5f6\" stroke=\"#d9dee3\"\u003e\u003c\/rect\u003e\u003crect x=\"225\" y=\"24\" width=\"170\" height=\"84\" rx=\"16\" fill=\"#f3f5f6\" stroke=\"#d9dee3\"\u003e\u003c\/rect\u003e\u003crect x=\"430\" y=\"24\" width=\"170\" height=\"84\" rx=\"16\" fill=\"#fff6ee\" stroke=\"#ef6f07\"\u003e\u003c\/rect\u003e\n          \u003ctext x=\"52\" y=\"60\" font-size=\"20\" font-weight=\"700\"\u003eCapacity\u003c\/text\u003e\u003ctext x=\"42\" y=\"86\" font-size=\"30\" font-weight=\"900\"\u003e2.5Ah\u003c\/text\u003e\n          \u003ctext x=\"265\" y=\"60\" font-size=\"20\" font-weight=\"700\"\u003eVoltage\u003c\/text\u003e\u003ctext x=\"258\" y=\"86\" font-size=\"30\" font-weight=\"900\"\u003e3.6V\u003c\/text\u003e\n          \u003ctext x=\"468\" y=\"60\" font-size=\"20\" font-weight=\"700\" fill=\"#ef6f07\"\u003eNominal Energy\u003c\/text\u003e\u003ctext x=\"485\" y=\"86\" font-size=\"30\" font-weight=\"900\" fill=\"#ef6f07\"\u003e≈ 9.0Wh\u003c\/text\u003e\n          \u003ctext x=\"196\" y=\"77\" font-size=\"32\" font-weight=\"900\"\u003e×\u003c\/text\u003e\u003ctext x=\"402\" y=\"77\" font-size=\"32\" font-weight=\"900\"\u003e=\u003c\/text\u003e\n        \u003c\/svg\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e4. C-Rate Conversion\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eFor a 2500mAh cell, 1C equals approximately 2.5A.\u003c\/p\u003e\n\u003ctable class=\"spec-table\" aria-label=\"C-rate conversion table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003e0.5C\u003c\/th\u003e\n\u003ctd\u003e1.25A standard charge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e1C\u003c\/th\u003e\n\u003ctd\u003e2.5A normalized current reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e4A\u003c\/th\u003e\n\u003ctd\u003e≈1.6C rated charge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e10A\u003c\/th\u003e\n\u003ctd\u003e≈4C rated discharge-capacity test\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e20A\u003c\/th\u003e\n\u003ctd\u003e≈8C maximum continuous discharge rating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e100A\u003c\/th\u003e\n\u003ctd\u003e≈40C momentary pulse characterization, \u0026lt;1 second\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003cdiv class=\"two-col\"\u003e\n\u003cdiv\u003e\n\u003ch2\u003eDischarge-rate capability is the 25R’s primary strength.\u003c\/h2\u003e\n\u003cp\u003eSamsung’s product specification indexes discharge-rate capability against the 10A rated-discharge result: 5A is listed at 97%, 10A at 100%, and 20A at 95%. Samsung’s characterization material also shows discharge data through 25A, but cell temperature rises sharply at the highest currents, so 20A remains the correct continuous product rating.\u003c\/p\u003e\n\u003cp class=\"muted\"\u003eThe simplified discharge graph below visualizes voltage versus capacity under 5A, 10A, 20A, and 25A loading so shoppers can understand the trade-off between current, voltage sag, delivered energy, and heat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mini-card\"\u003e\n\u003ch3\u003eRate and energy summary\u003c\/h3\u003e\n\u003ctable class=\"spec-table\" aria-label=\"Rate and energy table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003e1C \/ 2.5A\u003c\/th\u003e\n\u003ctd\u003e9.02Wh, 3.61V average in Samsung characterization\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e5A\u003c\/th\u003e\n\u003ctd\u003e8.95Wh, 3.54V average\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e10A\u003c\/th\u003e\n\u003ctd\u003e8.79Wh, 3.44V average\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e15A\u003c\/th\u003e\n\u003ctd\u003e8.55Wh, 3.35V average\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e20A\u003c\/th\u003e\n\u003ctd\u003e8.25Wh, 3.27V average\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e25A\u003c\/th\u003e\n\u003ctd\u003e7.84Wh, 3.18V average, high temperature rise in characterization\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-grid\"\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e5. Simplified Discharge-Curve Graph\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eVoltage vs. capacity illustration under 5A, 10A, 20A, and 25A discharge. Simplified for product-page visualization.\u003c\/p\u003e\n\u003csvg class=\"diagram\" viewbox=\"0 0 720 400\" role=\"img\" aria-label=\"Samsung 25R simplified discharge curve graph voltage versus capacity\"\u003e\n          \u003crect x=\"58\" y=\"26\" width=\"610\" height=\"300\" fill=\"#fff\"\u003e\u003c\/rect\u003e\u003cline x1=\"70\" y1=\"40\" x2=\"70\" y2=\"326\" stroke=\"#aeb7bf\" stroke-width=\"2\"\u003e\u003c\/line\u003e\u003cline x1=\"70\" y1=\"326\" x2=\"660\" y2=\"326\" stroke=\"#aeb7bf\" stroke-width=\"2\"\u003e\u003c\/line\u003e\n          \u003cg stroke=\"#e1e6ea\" stroke-width=\"1\"\u003e\u003cline x1=\"70\" y1=\"90\" x2=\"660\" y2=\"90\"\u003e\u003c\/line\u003e\u003cline x1=\"70\" y1=\"140\" x2=\"660\" y2=\"140\"\u003e\u003c\/line\u003e\u003cline x1=\"70\" y1=\"190\" x2=\"660\" y2=\"190\"\u003e\u003c\/line\u003e\u003cline x1=\"70\" y1=\"240\" x2=\"660\" y2=\"240\"\u003e\u003c\/line\u003e\u003cline x1=\"70\" y1=\"290\" x2=\"660\" y2=\"290\"\u003e\u003c\/line\u003e\u003cline x1=\"188\" y1=\"40\" x2=\"188\" y2=\"326\"\u003e\u003c\/line\u003e\u003cline x1=\"306\" y1=\"40\" x2=\"306\" y2=\"326\"\u003e\u003c\/line\u003e\u003cline x1=\"424\" y1=\"40\" x2=\"424\" y2=\"326\"\u003e\u003c\/line\u003e\u003cline x1=\"542\" y1=\"40\" x2=\"542\" y2=\"326\"\u003e\u003c\/line\u003e\u003c\/g\u003e\n          \u003ctext x=\"17\" y=\"45\" font-size=\"13\" fill=\"#66707a\"\u003e4.2V\u003c\/text\u003e\u003ctext x=\"17\" y=\"95\" font-size=\"13\" fill=\"#66707a\"\u003e3.9V\u003c\/text\u003e\u003ctext x=\"17\" y=\"145\" font-size=\"13\" fill=\"#66707a\"\u003e3.6V\u003c\/text\u003e\u003ctext x=\"17\" y=\"195\" font-size=\"13\" fill=\"#66707a\"\u003e3.3V\u003c\/text\u003e\u003ctext x=\"17\" y=\"245\" font-size=\"13\" fill=\"#66707a\"\u003e3.0V\u003c\/text\u003e\u003ctext x=\"17\" y=\"295\" font-size=\"13\" fill=\"#66707a\"\u003e2.7V\u003c\/text\u003e\u003ctext x=\"17\" y=\"329\" font-size=\"13\" fill=\"#66707a\"\u003e2.5V\u003c\/text\u003e\n          \u003ctext x=\"65\" y=\"352\" font-size=\"13\" fill=\"#66707a\"\u003e0\u003c\/text\u003e\u003ctext x=\"178\" y=\"352\" font-size=\"13\" fill=\"#66707a\"\u003e600\u003c\/text\u003e\u003ctext x=\"296\" y=\"352\" font-size=\"13\" fill=\"#66707a\"\u003e1200\u003c\/text\u003e\u003ctext x=\"414\" y=\"352\" font-size=\"13\" fill=\"#66707a\"\u003e1800\u003c\/text\u003e\u003ctext x=\"532\" y=\"352\" font-size=\"13\" fill=\"#66707a\"\u003e2400\u003c\/text\u003e\u003ctext x=\"628\" y=\"352\" font-size=\"13\" fill=\"#66707a\"\u003emAh\u003c\/text\u003e\n          \u003ctext x=\"295\" y=\"386\" font-size=\"15\" fill=\"#1f2328\" font-weight=\"700\"\u003eCapacity delivered\u003c\/text\u003e\u003ctext transform=\"rotate(-90 18 180)\" x=\"18\" y=\"180\" font-size=\"15\" fill=\"#1f2328\" font-weight=\"700\"\u003eCell voltage\u003c\/text\u003e\n          \u003cpath d=\"M70 58 C120 70, 165 81, 210 97 C270 119, 330 143, 390 173 C450 204, 502 239, 548 276 C585 304, 615 317, 636 322\" fill=\"none\" stroke=\"#0b7f3a\" stroke-width=\"5\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\n          \u003cpath d=\"M70 72 C120 86, 165 100, 210 118 C270 145, 322 173, 380 205 C432 236, 475 263, 510 292 C538 312, 560 321, 580 323\" fill=\"none\" stroke=\"#ef6f07\" stroke-width=\"5\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\n          \u003cpath d=\"M70 90 C120 106, 160 122, 205 144 C260 174, 306 204, 355 236 C400 266, 435 291, 462 306 C486 320, 503 323, 520 326\" fill=\"none\" stroke=\"#1428a0\" stroke-width=\"5\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\n          \u003cpath d=\"M70 105 C118 123, 158 143, 200 168 C250 200, 294 232, 338 262 C376 289, 408 307, 432 317 C450 324, 465 326, 478 326\" fill=\"none\" stroke=\"#c81825\" stroke-width=\"5\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\n          \u003crect x=\"455\" y=\"52\" width=\"185\" height=\"104\" rx=\"12\" fill=\"#ffffff\" stroke=\"#d9dee3\"\u003e\u003c\/rect\u003e\u003cline x1=\"470\" y1=\"76\" x2=\"500\" y2=\"76\" stroke=\"#0b7f3a\" stroke-width=\"5\" stroke-linecap=\"round\"\u003e\u003c\/line\u003e\u003ctext x=\"510\" y=\"81\" font-size=\"14\" fill=\"#1f2328\"\u003e5A moderate\u003c\/text\u003e\u003cline x1=\"470\" y1=\"100\" x2=\"500\" y2=\"100\" stroke=\"#ef6f07\" stroke-width=\"5\" stroke-linecap=\"round\"\u003e\u003c\/line\u003e\u003ctext x=\"510\" y=\"105\" font-size=\"14\" fill=\"#1f2328\"\u003e10A rated\u003c\/text\u003e\u003cline x1=\"470\" y1=\"124\" x2=\"500\" y2=\"124\" stroke=\"#1428a0\" stroke-width=\"5\" stroke-linecap=\"round\"\u003e\u003c\/line\u003e\u003ctext x=\"510\" y=\"129\" font-size=\"14\" fill=\"#1f2328\"\u003e20A CDR\u003c\/text\u003e\u003cline x1=\"470\" y1=\"148\" x2=\"500\" y2=\"148\" stroke=\"#c81825\" stroke-width=\"5\" stroke-linecap=\"round\"\u003e\u003c\/line\u003e\u003ctext x=\"510\" y=\"153\" font-size=\"14\" fill=\"#1f2328\"\u003e25A test point\u003c\/text\u003e\n        \u003c\/svg\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e6. Estimated IR Voltage Drop\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eUsing the specification limit of ≤18mΩ AC impedance as a fast order-of-magnitude planning reference.\u003c\/p\u003e\n\u003csvg class=\"diagram\" viewbox=\"0 0 620 170\" role=\"img\" aria-label=\"Samsung 25R voltage sag formula diagram\"\u003e\n          \u003crect x=\"18\" y=\"22\" width=\"584\" height=\"128\" rx=\"18\" fill=\"#f6f8fa\" stroke=\"#d9dee3\"\u003e\u003c\/rect\u003e\u003ctext x=\"38\" y=\"58\" font-size=\"18\" font-weight=\"700\"\u003eV_drop ≈ I × R\u003c\/text\u003e\u003ctext x=\"38\" y=\"88\" font-size=\"16\"\u003eAt 20A and 18mΩ: ≈0.36V estimated internal drop\u003c\/text\u003e\u003ctext x=\"38\" y=\"116\" font-size=\"16\"\u003eAt 10A and 18mΩ: ≈0.18V estimated internal drop\u003c\/text\u003e\u003ctext x=\"365\" y=\"58\" font-size=\"14\" fill=\"#66707a\"\u003ePack busbars, welds, holders, and BMS also add resistance\u003c\/text\u003e\u003ctext x=\"365\" y=\"82\" font-size=\"14\" fill=\"#66707a\"\u003eActual sag changes with temperature, SOC, age, and duty cycle\u003c\/text\u003e\n        \u003c\/svg\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eThermal conditions affect current capability, cycle life, and voltage behavior.\u003c\/h2\u003e\n\u003cp class=\"muted\"\u003eThe Samsung 25R is often used near its current ceiling, so temperature rise should be treated as a primary design constraint. Characterization data shows a sharp increase in surface temperature as discharge current rises from 10A to 20A and beyond.\u003c\/p\u003e\n\u003cdiv class=\"chart-grid\"\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e7. Charge Profile Reference\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eStandard charge: 1.25A CC-CV to 4.2V, terminate at 125mA. Rated charge: 4A CC-CV to 4.2V, terminate at 100mA.\u003c\/p\u003e\n\u003csvg class=\"diagram\" viewbox=\"0 0 700 360\" role=\"img\" aria-label=\"Samsung 25R charge profile diagram\"\u003e\u003cline x1=\"60\" y1=\"300\" x2=\"650\" y2=\"300\" stroke=\"#b5bec7\" stroke-width=\"2\"\u003e\u003c\/line\u003e\u003cline x1=\"60\" y1=\"30\" x2=\"60\" y2=\"300\" stroke=\"#b5bec7\" stroke-width=\"2\"\u003e\u003c\/line\u003e\u003cpath d=\"M70 220 L240 220 L330 120 L520 120\" fill=\"none\" stroke=\"#0b7f3a\" stroke-width=\"6\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003cpath d=\"M520 120 C560 120, 590 150, 612 220 C620 246, 625 265, 630 280\" fill=\"none\" stroke=\"#ef6f07\" stroke-width=\"6\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003ctext x=\"92\" y=\"210\" font-size=\"15\" font-weight=\"700\"\u003eCC stage\u003c\/text\u003e\u003ctext x=\"525\" y=\"112\" font-size=\"15\" font-weight=\"700\"\u003eCV hold @ 4.2V\u003c\/text\u003e\u003ctext x=\"525\" y=\"230\" font-size=\"14\" fill=\"#1f2328\"\u003eCurrent tapers to 125mA \/ 100mA\u003c\/text\u003e\u003ctext x=\"18\" y=\"40\" font-size=\"14\" fill=\"#66707a\"\u003eVoltage \/ current\u003c\/text\u003e\u003ctext x=\"315\" y=\"338\" font-size=\"15\" font-weight=\"700\"\u003eCharge time progression\u003c\/text\u003e\u003c\/svg\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e8. Thermal Operating Envelope\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003ePublished operating temperature ranges from the Samsung product specification.\u003c\/p\u003e\n\u003csvg class=\"diagram\" viewbox=\"0 0 700 330\" role=\"img\" aria-label=\"Samsung 25R thermal operating envelope\"\u003e\u003cline x1=\"70\" y1=\"160\" x2=\"640\" y2=\"160\" stroke=\"#d7dde3\" stroke-width=\"10\" stroke-linecap=\"round\"\u003e\u003c\/line\u003e\u003cline x1=\"235\" y1=\"110\" x2=\"420\" y2=\"110\" stroke=\"#0b7f3a\" stroke-width=\"22\" stroke-linecap=\"round\"\u003e\u003c\/line\u003e\u003cline x1=\"70\" y1=\"215\" x2=\"540\" y2=\"215\" stroke=\"#ef6f07\" stroke-width=\"22\" stroke-linecap=\"round\"\u003e\u003c\/line\u003e\u003ctext x=\"224\" y=\"86\" font-size=\"18\" font-weight=\"700\" fill=\"#0b7f3a\"\u003eCharge: 0°C to 45°C\u003c\/text\u003e\u003ctext x=\"86\" y=\"244\" font-size=\"18\" font-weight=\"700\" fill=\"#ef6f07\"\u003eDischarge: -20°C to 60°C\u003c\/text\u003e\u003cline x1=\"610\" y1=\"188\" x2=\"610\" y2=\"240\" stroke=\"#c81825\" stroke-dasharray=\"6 6\"\u003e\u003c\/line\u003e\u003ctext x=\"410\" y=\"177\" font-size=\"14\" fill=\"#c81825\"\u003eDo not set discharge over-temp protection above 70°C cell surface\u003c\/text\u003e\u003ctext x=\"112\" y=\"290\" font-size=\"14\" fill=\"#66707a\"\u003ePack protection should be based on the hottest cell-surface location.\u003c\/text\u003e\u003c\/svg\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e9. Rate Capability and Heat Rise\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eSamsung characterization data: capacity stays strong, but temperature rises rapidly with current.\u003c\/p\u003e\n\u003csvg class=\"diagram\" viewbox=\"0 0 700 360\" role=\"img\" aria-label=\"Samsung 25R rate capability and temperature chart\"\u003e\u003cline x1=\"70\" y1=\"310\" x2=\"650\" y2=\"310\" stroke=\"#aeb7bf\" stroke-width=\"2\"\u003e\u003c\/line\u003e\u003cline x1=\"70\" y1=\"40\" x2=\"70\" y2=\"310\" stroke=\"#aeb7bf\" stroke-width=\"2\"\u003e\u003c\/line\u003e\u003cg stroke=\"#e3e7eb\" stroke-width=\"1\"\u003e\u003cline x1=\"70\" y1=\"250\" x2=\"650\" y2=\"250\"\u003e\u003c\/line\u003e\u003cline x1=\"70\" y1=\"190\" x2=\"650\" y2=\"190\"\u003e\u003c\/line\u003e\u003cline x1=\"70\" y1=\"130\" x2=\"650\" y2=\"130\"\u003e\u003c\/line\u003e\u003cline x1=\"70\" y1=\"70\" x2=\"650\" y2=\"70\"\u003e\u003c\/line\u003e\u003c\/g\u003e\u003crect x=\"98\" y=\"70\" width=\"44\" height=\"240\" rx=\"8\" fill=\"#0b7f3a\"\u003e\u003c\/rect\u003e\u003crect x=\"198\" y=\"76\" width=\"44\" height=\"234\" rx=\"8\" fill=\"#0b7f3a\"\u003e\u003c\/rect\u003e\u003crect x=\"298\" y=\"70\" width=\"44\" height=\"240\" rx=\"8\" fill=\"#0b7f3a\"\u003e\u003c\/rect\u003e\u003crect x=\"398\" y=\"72\" width=\"44\" height=\"238\" rx=\"8\" fill=\"#0b7f3a\"\u003e\u003c\/rect\u003e\u003crect x=\"498\" y=\"76\" width=\"44\" height=\"234\" rx=\"8\" fill=\"#0b7f3a\"\u003e\u003c\/rect\u003e\u003crect x=\"598\" y=\"82\" width=\"44\" height=\"228\" rx=\"8\" fill=\"#0b7f3a\"\u003e\u003c\/rect\u003e\u003cpolyline points=\"120,255 220,230 320,190 420,150 520,112 620,82\" fill=\"none\" stroke=\"#c81825\" stroke-width=\"5\" stroke-linecap=\"round\"\u003e\u003c\/polyline\u003e\u003ctext x=\"102\" y=\"333\" font-size=\"13\"\u003e1C\u003c\/text\u003e\u003ctext x=\"205\" y=\"333\" font-size=\"13\"\u003e5A\u003c\/text\u003e\u003ctext x=\"305\" y=\"333\" font-size=\"13\"\u003e10A\u003c\/text\u003e\u003ctext x=\"405\" y=\"333\" font-size=\"13\"\u003e15A\u003c\/text\u003e\u003ctext x=\"505\" y=\"333\" font-size=\"13\"\u003e20A\u003c\/text\u003e\u003ctext x=\"605\" y=\"333\" font-size=\"13\"\u003e25A\u003c\/text\u003e\u003ctext x=\"340\" y=\"353\" font-size=\"15\" font-weight=\"700\"\u003eDischarge current\u003c\/text\u003e\u003ctext x=\"134\" y=\"55\" font-size=\"14\" font-weight=\"700\" fill=\"#0b7f3a\"\u003eCapacity remains near 2.5Ah\u003c\/text\u003e\u003ctext x=\"390\" y=\"95\" font-size=\"14\" font-weight=\"700\" fill=\"#c81825\"\u003eTemperature rises strongly\u003c\/text\u003e\u003c\/svg\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e10. Energy and Average Voltage vs Current\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eHigher current lowers average voltage and delivered watt-hours.\u003c\/p\u003e\n\u003ctable class=\"spec-table\" aria-label=\"Energy and average voltage table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003e1C\u003c\/th\u003e\n\u003ctd\u003e9.02Wh, 3.61V average\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e5A\u003c\/th\u003e\n\u003ctd\u003e8.95Wh, 3.54V average\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e10A\u003c\/th\u003e\n\u003ctd\u003e8.79Wh, 3.44V average\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e15A\u003c\/th\u003e\n\u003ctd\u003e8.55Wh, 3.35V average\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e20A\u003c\/th\u003e\n\u003ctd\u003e8.25Wh, 3.27V average\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e25A\u003c\/th\u003e\n\u003ctd\u003e7.84Wh, 3.18V average\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e11. Cycle-Life Visualization\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eProduct specification criterion: ≥1500mAh after 250 cycles using rated charge and 20A discharge.\u003c\/p\u003e\n\u003csvg class=\"diagram\" viewbox=\"0 0 700 360\" role=\"img\" aria-label=\"Samsung 25R cycle life chart\"\u003e\u003cline x1=\"70\" y1=\"305\" x2=\"650\" y2=\"305\" stroke=\"#aeb7bf\" stroke-width=\"2\"\u003e\u003c\/line\u003e\u003cline x1=\"70\" y1=\"40\" x2=\"70\" y2=\"305\" stroke=\"#aeb7bf\" stroke-width=\"2\"\u003e\u003c\/line\u003e\u003cg stroke=\"#e3e7eb\" stroke-width=\"1\"\u003e\u003cline x1=\"70\" y1=\"250\" x2=\"650\" y2=\"250\"\u003e\u003c\/line\u003e\u003cline x1=\"70\" y1=\"195\" x2=\"650\" y2=\"195\"\u003e\u003c\/line\u003e\u003cline x1=\"70\" y1=\"140\" x2=\"650\" y2=\"140\"\u003e\u003c\/line\u003e\u003cline x1=\"70\" y1=\"85\" x2=\"650\" y2=\"85\"\u003e\u003c\/line\u003e\u003c\/g\u003e\u003cpath d=\"M90 75 C200 104, 310 145, 420 190 C520 230, 585 248, 625 250\" fill=\"none\" stroke=\"#0b7f3a\" stroke-width=\"6\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003cline x1=\"70\" y1=\"250\" x2=\"650\" y2=\"250\" stroke=\"#c81825\" stroke-width=\"2\" stroke-dasharray=\"8 8\"\u003e\u003c\/line\u003e\u003ctext x=\"500\" y=\"242\" font-size=\"14\" fill=\"#c81825\"\u003e60% capacity line\u003c\/text\u003e\u003ccircle cx=\"625\" cy=\"250\" r=\"7\" fill=\"#ef6f07\"\u003e\u003c\/circle\u003e\u003ctext x=\"430\" y=\"276\" font-size=\"14\" fill=\"#1f2328\"\u003e≥1500mAh after 250 cycles\u003c\/text\u003e\u003ctext x=\"79\" y=\"326\" font-size=\"13\"\u003e0\u003c\/text\u003e\u003ctext x=\"210\" y=\"326\" font-size=\"13\"\u003e50\u003c\/text\u003e\u003ctext x=\"335\" y=\"326\" font-size=\"13\"\u003e100\u003c\/text\u003e\u003ctext x=\"460\" y=\"326\" font-size=\"13\"\u003e150\u003c\/text\u003e\u003ctext x=\"588\" y=\"326\" font-size=\"13\"\u003e250\u003c\/text\u003e\u003ctext x=\"25\" y=\"89\" font-size=\"13\" fill=\"#66707a\"\u003e100%\u003c\/text\u003e\u003ctext x=\"25\" y=\"145\" font-size=\"13\" fill=\"#66707a\"\u003e80%\u003c\/text\u003e\u003ctext x=\"25\" y=\"253\" font-size=\"13\" fill=\"#66707a\"\u003e60%\u003c\/text\u003e\u003ctext x=\"250\" y=\"350\" font-size=\"15\" font-weight=\"700\"\u003eCycle count\u003c\/text\u003e\u003c\/svg\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e12. Storage Recovery Reference\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eSamsung product specification: capacity recovery after 30 days at 60°C should be ≥1960mAh.\u003c\/p\u003e\n\u003ctable class=\"spec-table\" aria-label=\"Storage recovery table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eCondition\u003c\/th\u003e\n\u003ctd\u003eRated charge, storage for 30 days at 60°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMeasurement\u003c\/th\u003e\n\u003ctd\u003e10A discharge to 2.5V at room temperature\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMinimum Recovery\u003c\/th\u003e\n\u003ctd\u003e≥1960mAh, equal to 80% of rated capacity\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStorage Guidance\u003c\/th\u003e\n\u003ctd\u003eFor long storage, keep cells dry and cool, and avoid full-charge or high-temperature storage where possible.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003e18650 dimensional envelope for holders, packs, and chargers.\u003c\/h2\u003e\n\u003cp class=\"muted\"\u003eThe Samsung product specification gives a maximum 65.00mm height and 18.40mm diameter; characterization material lists 18.33 ± 0.07mm diameter and 64.85 ± 0.15mm height.\u003c\/p\u003e\n\u003cdiv class=\"chart-grid\"\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e13. Cell Dimension Diagram\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eMechanical envelope for 18650 holders, pack CAD, wrappers, and spot-weld layouts.\u003c\/p\u003e\n\u003csvg class=\"diagram\" viewbox=\"0 0 700 420\" role=\"img\" aria-label=\"Samsung 25R mechanical dimension diagram\"\u003e\u003crect x=\"120\" y=\"160\" width=\"420\" height=\"92\" rx=\"45\" fill=\"#d9dee3\" stroke=\"#929aa3\" stroke-width=\"2\"\u003e\u003c\/rect\u003e\u003crect x=\"125\" y=\"165\" width=\"400\" height=\"82\" rx=\"41\" fill=\"#0b7f3a\"\u003e\u003c\/rect\u003e\u003crect x=\"525\" y=\"182\" width=\"18\" height=\"48\" rx=\"8\" fill=\"#c6ced5\"\u003e\u003c\/rect\u003e\u003cline x1=\"120\" y1=\"108\" x2=\"540\" y2=\"108\" stroke=\"#ef6f07\" stroke-width=\"3\"\u003e\u003c\/line\u003e\u003cline x1=\"120\" y1=\"118\" x2=\"120\" y2=\"155\" stroke=\"#ef6f07\" stroke-width=\"2\"\u003e\u003c\/line\u003e\u003cline x1=\"540\" y1=\"118\" x2=\"540\" y2=\"155\" stroke=\"#ef6f07\" stroke-width=\"2\"\u003e\u003c\/line\u003e\u003cline x1=\"590\" y1=\"160\" x2=\"590\" y2=\"252\" stroke=\"#1428a0\" stroke-width=\"3\"\u003e\u003c\/line\u003e\u003cline x1=\"552\" y1=\"160\" x2=\"585\" y2=\"160\" stroke=\"#1428a0\" stroke-width=\"2\"\u003e\u003c\/line\u003e\u003cline x1=\"552\" y1=\"252\" x2=\"585\" y2=\"252\" stroke=\"#1428a0\" stroke-width=\"2\"\u003e\u003c\/line\u003e\u003ctext x=\"248\" y=\"96\" font-size=\"22\" font-weight=\"900\" fill=\"#ef6f07\"\u003e65.00mm max\u003c\/text\u003e\u003ctext x=\"606\" y=\"212\" font-size=\"22\" font-weight=\"900\" fill=\"#1428a0\" transform=\"rotate(90 606 212)\"\u003e18.40mm max\u003c\/text\u003e\u003ctext x=\"195\" y=\"292\" font-size=\"16\" fill=\"#1f2328\"\u003eCylindrical cell with outer tube \/ wrap included in stated envelope\u003c\/text\u003e\u003ctext x=\"212\" y=\"316\" font-size=\"14\" fill=\"#66707a\"\u003eAlways confirm real fit in holders, chargers, and welded pack fixtures.\u003c\/text\u003e\u003c\/svg\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e14. Pack Scaling Formulas\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eQuick math for series\/parallel planning.\u003c\/p\u003e\n\u003cp class=\"formula\"\u003ePack Voltage ≈ Series Count × 3.6V\u003c\/p\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003cp class=\"formula\"\u003ePack Capacity ≈ Parallel Count × 2.5Ah\u003c\/p\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003cp class=\"formula\"\u003ePack Energy ≈ S × P × 9.0Wh\u003c\/p\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003cp class=\"formula\"\u003ePack Current Capability ≈ Parallel Count × 20A\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e15. Example Parallel Scaling\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eApproximate scaling, assuming balanced cells and proper thermal\/electrical design.\u003c\/p\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003e1P\u003c\/th\u003e\n\u003ctd\u003e2.5Ah, 9.0Wh, 20A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e2P\u003c\/th\u003e\n\u003ctd\u003e5.0Ah, 18.0Wh, 40A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e3P\u003c\/th\u003e\n\u003ctd\u003e7.5Ah, 27.0Wh, 60A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e4P\u003c\/th\u003e\n\u003ctd\u003e10.0Ah, 36.0Wh, 80A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e5P\u003c\/th\u003e\n\u003ctd\u003e12.5Ah, 45.0Wh, 100A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e16. Common Series Voltage Examples\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eNominal voltage examples only. Full-charge and cut-off pack voltages scale separately.\u003c\/p\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003e1S\u003c\/th\u003e\n\u003ctd\u003e3.6V nominal \/ 4.2V full \/ 2.5V cut-off\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e3S\u003c\/th\u003e\n\u003ctd\u003e10.8V nominal \/ 12.6V full \/ 7.5V cut-off\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e4S\u003c\/th\u003e\n\u003ctd\u003e14.4V nominal \/ 16.8V full \/ 10.0V cut-off\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e10S\u003c\/th\u003e\n\u003ctd\u003e36.0V nominal \/ 42.0V full \/ 25.0V cut-off\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e13S\u003c\/th\u003e\n\u003ctd\u003e46.8V nominal \/ 54.6V full \/ 32.5V cut-off\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eBest suited for high-drain 18650 systems with proven pack controls.\u003c\/h2\u003e\n\u003cdiv class=\"three-col\"\u003e\n\u003cdiv class=\"application-card\"\u003e\n\u003ch3\u003ePower Tools\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eClassic use case for the 25R power-cell profile.\u003c\/li\u003e\n\u003cli\u003eWorks well in packs that need discharge capability more than maximum energy per cell.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"application-card\"\u003e\n\u003ch3\u003eRC \/ Robotics\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAppropriate for motor-driven systems with controlled high-current duty cycles.\u003c\/li\u003e\n\u003cli\u003ePack temperature and voltage sag should be validated under real load.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"application-card\"\u003e\n\u003ch3\u003eHigh-Output Lighting\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eReliable fit for 18650 lights designed for unprotected flat-top cells.\u003c\/li\u003e\n\u003cli\u003eGood voltage support under high LED-driver current.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"application-card\"\u003e\n\u003ch3\u003eCustom Battery Packs\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eUseful for designers optimizing around current-per-cell and common 18650 size.\u003c\/li\u003e\n\u003cli\u003eRequires matched cells, welding, BMS, and thermal controls.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"application-card\"\u003e\n\u003ch3\u003ePortable Equipment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBalanced option for devices that need more current than energy-focused cells provide.\u003c\/li\u003e\n\u003cli\u003eUse only in protected, compatible systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"application-card\"\u003e\n\u003ch3\u003eRuntime-Focused Packs\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNot the maximum-capacity choice.\u003c\/li\u003e\n\u003cli\u003eConsider 3000mAh–3500mAh energy cells when current demand is lower.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eSafety, Handling \u0026amp; Compatibility Notice\u003c\/h2\u003e\n\u003cp\u003eThis product is an \u003cstrong\u003eunprotected lithium-ion cell\u003c\/strong\u003e. It should only be used by customers who understand cell-level lithium-ion safety and who are using the battery in compatible hardware, managed packs, or professionally designed assemblies. Improper use can lead to overheating, venting, fire, or explosion.\u003c\/p\u003e\n\u003cul class=\"checklist\"\u003e\n\u003cli\u003eCharge only with lithium-ion chargers or managed battery systems designed for the correct chemistry and cell count.\u003c\/li\u003e\n\u003cli\u003eNever short circuit, crush, puncture, incinerate, or expose the cell to water.\u003c\/li\u003e\n\u003cli\u003eDo not use cells with damaged wraps, dented cans, or missing top insulator rings.\u003c\/li\u003e\n\u003cli\u003eDo not mix with cells of different age, capacity, or state of charge in the same pack.\u003c\/li\u003e\n\u003cli\u003eUse spot welding for pack assembly; do not solder directly to the cell body.\u003c\/li\u003e\n\u003cli\u003eStore and transport in non-conductive cases; never carry loose cells in pockets or bags.\u003c\/li\u003e\n\u003cli\u003eNot for e-cigarette, vape, or similar use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eCommon technical questions about the Samsung 25R.\u003c\/h2\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003eWhat is the capacity of the Samsung 25R?\u003c\/h3\u003e\n\u003cp\u003eThe Samsung product specification lists 2500mAh minimum standard discharge capacity and 2450mAh minimum rated discharge capacity at 10A.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003eWhat is the discharge rating?\u003c\/h3\u003e\n\u003cp\u003eThe maximum continuous discharge rating is 20A at room temperature. Samsung characterization material also includes higher-current test points, but those are not the primary continuous product rating.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003eIs this a protected battery?\u003c\/h3\u003e\n\u003cp\u003eNo. This is an unprotected bare 18650 cell and should only be used in compatible equipment or battery packs with proper voltage, current, short-circuit, and temperature protection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003eWhat charger should be used?\u003c\/h3\u003e\n\u003cp\u003eUse a lithium-ion charger or BMS using a CC-CV profile to 4.20V per cell. Standard charge is 1.25A; rated charge is 4A.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003eWhat is the discharge cut-off voltage?\u003c\/h3\u003e\n\u003cp\u003eThe Samsung product specification uses 2.50V as the end-of-discharge voltage. Some systems may use a higher cut-off to reduce stress and improve service life.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003eCan the Samsung 25R be used in battery packs?\u003c\/h3\u003e\n\u003cp\u003eYes. It is widely used in custom 18650 packs where current capability matters, but packs must use matched cells, proper welding, insulation, fusing, BMS protection, and thermal validation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003eWhat are the cell dimensions?\u003c\/h3\u003e\n\u003cp\u003eSamsung’s product specification lists a maximum height of 65.00mm and maximum diameter of 18.40mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003eWhat temperature range is allowed?\u003c\/h3\u003e\n\u003cp\u003eThe product specification lists charge operation from 0°C to 45°C and discharge operation from -20°C to 60°C ambient. Samsung also notes that discharge over-temperature protection should not exceed 70°C at the cell surface.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003eHow many cycles should I expect?\u003c\/h3\u003e\n\u003cp\u003eThe product specification states capacity should remain at least 1500mAh after 250 cycles using rated charge and 20A discharge under the stated room-temperature conditions. Real service life depends heavily on load, temperature, depth of discharge, and charge limits.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003eCan I carry this battery loose?\u003c\/h3\u003e\n\u003cp\u003eNo. Loose transport is unsafe because metal objects can short the terminals. Always use a non-conductive battery case.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0481\/9678\/0183\/files\/ChatGPT_Image_Jun_17_2026_06_04_27_AM.png?v=1781690685\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0481\/9678\/0183\/files\/ChatGPT_Image_Jun_17_2026_06_04_12_AM.png?v=1781690685\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0481\/9678\/0183\/files\/625472654743624562456.jpg?v=1738986702\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0481\/9678\/0183\/files\/5475672457654624562456.jpg?v=1738986702\" alt=\"\"\u003e\u003c\/p\u003e","brand":"Samsung","offers":[{"title":"Default Title","offer_id":48334315684085,"sku":"INR18650-25R","price":49.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0789\/8274\/2261\/files\/epoch_18650_25r_cells_professional_reflection.png?v=1782808400","url":"https:\/\/nortrano.com\/products\/samsung-25r-18650","provider":"nortrano","version":"1.0","type":"link"}