{"product_id":"2-pack-3-7v-rechargeable-battery-2500mah-high-capacity-flat-top-for-headlamp-led-flashlight","title":"2-Pack 2500mAh 25A High Drain 18650 Flat Top Battery – for High-Output Flashlights, Power Tools \u0026 RC","description":"\u003ch4\u003e\u003cspan class=\"\"\u003eShort Description\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eUnleash serious power with this 2-pack of 2500mAh 25A high-drain 18650 flat top batteries. Engineered for demanding devices that require instant, sustained current, these cells deliver a true 25A continuous discharge with minimal voltage sag. The flat top design ensures broad compatibility with spring-loaded contacts and makes spot-welding into custom packs simple. Ideal for high-wattage vaping, FET-driven flashlights, cordless power tools, and high-performance RC models, this 2-pack provides the reliable, high-current energy your gear demands. When capacity alone isn’t enough, step up to genuine 25A output.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cspan class=\"\"\u003eKey Features\u003c\/span\u003e\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e25A Continuous High Drain\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e – Delivers massive, stable current for power-hungry devices.\u003c\/span\u003e\u003cspan class=\"\"\u003e Handles sub-ohm  power tool start-up surges, and RC bursts without overheating or significant voltage drop.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e2500mAh Optimized Capacity\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e – Balances runtime with the ability to safely output 25A.\u003c\/span\u003e\u003cspan class=\"\"\u003e Ideal for high-drain applications where current capability matters more than absolute maximum capacity.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eFlat Top Design\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e – Compatible with all standard 18650 spring-contact chargers, flashlights, and battery trays.\u003c\/span\u003e\u003cspan class=\"\"\u003e The flat positive terminal provides a reliable surface for spot-welding nickel strips in custom battery packs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eLow Internal Resistance\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e – Minimizes heat generation and energy loss, keeping your device cooler and ensuring full power delivery even under extreme loads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e2-Pack Convenience\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e – Perfect for single-cell mechanical mods, dual-battery regulated devices, or as spares for your high-drain flashlight or RC transmitter.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eVersatile High-Power Applications\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e – Suitable for vaping, high-output torches, cordless drills, impact drivers, RC cars, airsoft guns, and DIY high-current projects.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003e\u003cspan class=\"\"\u003eParameters\u003c\/span\u003e\u003c\/h4\u003e\n\u003cdiv class=\"ds-scroll-area ds-scroll-area--show-on-focus-within ds-scroll-area--enabled _1210dd7 c03cafe9\"\u003e\n\u003cdiv class=\"ds-scroll-area__gutters\"\u003e\n\u003cdiv class=\"ds-scroll-area__horizontal-gutter\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"ds-scroll-area__vertical-gutter\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctr\u003e\n\u003cth\u003e\u003cspan class=\"\"\u003eParameter\u003c\/span\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cspan class=\"\"\u003eSpecification\u003c\/span\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eTypical Capacity\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e2500 mAh (0.2C discharge to 2.5V)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eMinimum Capacity\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eApprox.\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e2400 mAh\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eNominal Voltage\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e3.6 V (typical operating 3.7 V)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eMax Continuous Discharge\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e\u003cspan class=\"\"\u003e25 A\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e (cell temperature ≤ 80°C)\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eMax Pulse Discharge\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eUp to 35–40 A (short burst, monitor temperature)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eDischarge Cut-off Voltage\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e2.5 V (do not over-discharge)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eStandard Charge\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eCC-CV, 0.5C (1250 mA) to 4.2 V, cut-off 50 mA\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eMax Charge Current\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e1C (2500 mA); fast charge above 1C requires temperature monitoring\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eInternal Resistance\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e≤ 20 mΩ (AC 1 kHz)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eCycle Life\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e≥ 250 cycles (to 80% capacity, 1C charge \/ 10A discharge)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eOperating Temperature (Discharge)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e-20°C to 60°C (ensure proper cooling for sustained 25A)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eTop Type\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eFlat Top\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eDimensions\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eApprox.\u003c\/span\u003e\u003c\/td\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e18.4 mm diameter × 65.0 mm length\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eWeight (single cell)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eApprox.\u003c\/span\u003e\u003c\/td\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e47 g\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003ePackage Includes\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e2 × 2500mAh 25A high-drain 18650 flat top cells in protective packaging\u003c\/span\u003e\u003c\/td\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch4\u003e\u003cspan class=\"\"\u003eApplications\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eRecommended For\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eHigh-Wattage Vaping\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e: Mechanical mods and regulated devices running sub-ohm builds (down to approximately 0.15Ω).\u003c\/span\u003e\u003cspan class=\"\"\u003e The 25A rating provides a safe margin for demanding coils.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eHigh-Output Flashlights\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e: FET-driven or direct-drive tactical lights, hot-rod multi-emitter torches, and custom builds that demand sustained current up to 25A for maximum brightness.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eCordless Power Tools\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e: Impact drivers, drills, wrenches, and small circular saws when used in properly engineered battery packs with a BMS.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eRC Cars, Boats \u0026amp; Airsoft\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e: High-torque motors and rapid-fire AEGs that need instant current bursts without voltage sag.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eDIY High-Current Projects\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e: Spot welder battery packs, portable jump starters, or any application where high burst current is critical.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eNot Recommended For\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eStandard Headlamps \u0026amp; Low-Power Flashlights\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e: These devices typically draw under 3A.\u003c\/span\u003e\u003cspan class=\"\"\u003e A 3500mAh 10A cell will provide nearly 40% longer runtime and is a better fit.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eSolar Lights, Sensors \u0026amp; Low-Drain Electronics\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e: The 25A capability is wasted, and the 2500mAh capacity limits runtime compared to high-capacity cells.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eStandard USB Power Banks\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e: Overkill in discharge rating, with lower capacity than 3500mAh alternatives.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eE-Bike or Long-Range Battery Packs\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e: Capacity per cell is too low for practical range; use higher-capacity cells or 21700 format batteries.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003e\u003cspan class=\"\"\u003eFAQ\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ: Can I use this battery for vaping, and what is the lowest safe resistance?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA: Yes, this is an excellent cell for high-power vaping. At 25A continuous and 3.6V nominal, it can safely power builds down to approximately 0.15Ω, providing a safe headroom. Always use Ohm’s law to calculate your actual current draw and never exceed 25A.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ: Is this a protected battery?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA: No, this is an unprotected flat top cell, which is standard for high-drain applications. This allows unrestricted current flow. Your device should have its own protection circuit, and for multi-cell packs, you must install an external BMS rated for at least 35A.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ: Why 2500mAh and not 3000mAh or 3500mAh?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA: High-drain cells like this one prioritize current delivery over maximum capacity. To safely output 25A with low internal resistance, the design trades some capacity. If your device draws less than 10A, a 3500mAh cell will offer longer runtime. For high-current devices, a stable voltage under load is far more important than a few hundred extra mAh.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ: Can I use these in a regular LED flashlight or headlamp?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA: Physically yes, but it is not recommended. Most standard flashlights and headlamps draw only 1–3A. A 3500mAh cell will give you significantly longer runtime. These 25A cells are designed for high-drain devices and will not provide any performance benefit in a low-drain light.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ: How should I store and maintain these cells?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA: Store in a cool, dry place at around 3.6–3.7V (approximately 40% state of charge). Use non-conductive battery cases to prevent short circuits. Never store fully charged or deeply discharged for extended periods. Allow cells to cool after heavy use before recharging.\u003c\/span\u003e\u003c\/p\u003e","brand":"OneAndes","offers":[{"title":"Default Title","offer_id":51454128685302,"sku":"OAS207","price":8.58,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/2pack-18650-2500mAh-high-capacity-lighting-main_e1f91a98-4b2d-43fc-8c3e-944988456e18.webp?v=1786965362","url":"https:\/\/oneandes.com\/products\/2-pack-3-7v-rechargeable-battery-2500mah-high-capacity-flat-top-for-headlamp-led-flashlight","provider":"OneAndes","version":"1.0","type":"link"}