{"title":"BTCAP 21700 Batteries","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eBTCAP 21700 cells give pack builders a value-focused option that balances capacity and current — practical cells for high-drain and custom builds.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eMoving up from 18650, the 21700 format brings more capacity and energy headroom in a compact cylindrical cell. BTCAP's 21700 line sits in the useful middle ground: enough capacity for real runtime, with discharge strong enough for high-drain pack work — without paying premium-brand prices.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eWhy builders choose them\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eValue-focused 21700 cells with balanced performance\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eCapacity and current suited to high-drain builds\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e21700 advantage in capacity and energy over 18650\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eA budget-conscious option for custom pack assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eBuilt for\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eCustom and DIY 21700 pack builds\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eHigh-drain electronics and tool packs\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eE-bike and light mobility builds\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eGeneral high-output applications\u003c\/li\u003e\n\u003c\/ul\u003e","products":[{"product_id":"btcap-42p-21700-4200mah-70a-battery","title":"BTCAP 21700 42P 3.6V 4200mAh 45A Battery","description":"\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e4200mAh Capacity:\u003c\/strong\u003e Provides long-lasting power for devices requiring extended runtime.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e45A Max Continuous Discharge:\u003c\/strong\u003e Delivers consistent high current output for demanding applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNMC Cathode Chemistry:\u003c\/strong\u003e Uses LiNiMnCoO\u003csub\u003e2\u003c\/sub\u003e for enhanced energy density and thermal reliability.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow Internal Resistance:\u003c\/strong\u003e ≤8mΩ for efficient energy transfer with minimal heat buildup.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRechargeable and Unprotected:\u003c\/strong\u003e Offers flexibility for builders integrating custom BMS solutions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cbr\u003e\n\u003cp\u003eThe \u003cstrong\u003eBTCAP 42P 21700\u003c\/strong\u003e is engineered for power-hungry systems, offering high discharge rates, superior NMC chemistry, and a reliable 4200mAh capacity. It's an ideal choice for e-mobility, DIY battery packs, power tools, and demanding electronics. This cell delivers stable output and extended cycle life, making it a cost-effective option for performance-focused builds.\u003c\/p\u003e\n\u003cbr\u003e\n\u003ch4\u003eApplications\/Uses\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePower Tools:\u003c\/strong\u003e Ideal for high-drain tools requiring rapid discharge without performance loss.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBattery Packs:\u003c\/strong\u003e Versatile for custom battery banks and energy storage setups.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eElectric Toys:\u003c\/strong\u003e Keeps RC cars, drones, and other devices powered longer.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConsumer Electronics:\u003c\/strong\u003e Great fit for portable devices requiring large bursts of power.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrototype Builds:\u003c\/strong\u003e Popular among makers and engineers building high-output systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cbr\u003e\n\u003ch4\u003eSPECIFICATIONS\u003c\/h4\u003e\n\u003cdiv class=\"table-wrapper\"\u003e\n  \u003ctable\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eManufacturer:\u003c\/td\u003e\n\u003ctd\u003eBTCAP\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eModel:\u003c\/td\u003e\n\u003ctd\u003e42P\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSize:\u003c\/td\u003e\n\u003ctd\u003e21700\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003ePositive Terminal:\u003c\/td\u003e\n\u003ctd\u003eFlat Top\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eNominal Capacity:\u003c\/td\u003e\n\u003ctd\u003e4200mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eContinuous Discharge Rating:\u003c\/td\u003e\n\u003ctd\u003e45A\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eNominal Voltage:\u003c\/td\u003e\n\u003ctd\u003e3.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMaximum Voltage:\u003c\/td\u003e\n\u003ctd\u003e4.2V\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eDischarge Cut-Off Voltage:\u003c\/td\u003e\n\u003ctd\u003e2.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eProtected:\u003c\/td\u003e\n\u003ctd\u003eNo, Unprotected\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eRechargeable:\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eApprox. Dimensions:\u003c\/td\u003e\n\u003ctd\u003e21.6mm x 70.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eApprox. Weight:\u003c\/td\u003e\n\u003ctd\u003e68g\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n","brand":"BTCAP","offers":[{"title":"Default Title","offer_id":52207933718838,"sku":"BTCAP-42P","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0721\/2761\/1190\/files\/BTCAP-42P_2.jpg?v=1759876107"}],"url":"https:\/\/18650battery.com\/collections\/btcap-21700-batteries.oembed","provider":"18650Battery","version":"1.0","type":"link"}