{"title":"Ampace 21700 Batteries","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eStepping up from 18650 to 21700? Ampace's tabless 21700 cells bring more capacity and real current headroom — low internal resistance, minimal voltage sag, and cooler running under heavy, sustained load.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eAmpace is a relatively recent entrant in cylindrical lithium-ion, but it has gone straight for the demanding end of the market: tabless, high-drain cells like the JP40 (4000mAh, 70A class) that are built to push real amps.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eThe tabless construction is the reason these perform the way they do. Older cells route all their current through one small welded tab — a chokepoint that adds resistance and concentrates heat when you lean on them. Tabless cells make contact across the entire electrode edge, which slashes internal resistance. For a pack builder, that translates directly into flatter voltage under load, less heat to manage, and stronger output that holds up through the discharge.\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\"\u003eTabless internal design — lower resistance, flatter discharge, cooler under load\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBuilt for high continuous current in serious pack builds\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e21700 capacity and energy advantage over 18650 cells\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eA competitive high-drain option at a builder-friendly price\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\"\u003ePower-tool packs and high-drain rebuilds\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eE-bike, e-scooter, and light EV battery packs\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eHigh-output RC and performance hobby builds\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eCustom 21700 pack assembly where current matters\u003c\/li\u003e\n\u003c\/ul\u003e","products":[{"product_id":"ampace-jp40-21700-4000mah-70a-battery","title":"Ampace JP40 21700 4000mAh 70A Tabless Battery","description":"\u003ch2\u003eAmpace JP40 – Built Tough for High-Drain DIY Projects\u003c\/h2\u003e\r\n\u003cp\u003eIf you’re building a powerful e-bike, tool pack, or custom energy rig, the Ampace JP40 is your go-to cell. With a massive 70A pulse discharge and fast charge support, it’s built to handle extreme output without compromising longevity.\u003c\/p\u003e\r\n\u003cul\u003e\r\n  \u003cli\u003e\n\u003cstrong\u003e4000mAh Capacity:\u003c\/strong\u003e Plenty of runtime in a single 21700 cell\u003c\/li\u003e\r\n  \u003cli\u003e\n\u003cstrong\u003eUp to 70A Peak:\u003c\/strong\u003e Delivers huge power bursts when needed\u003c\/li\u003e\r\n  \u003cli\u003e\n\u003cstrong\u003e4A Standard Charge \/ 8A Fast:\u003c\/strong\u003e Recharge faster, build smarter\u003c\/li\u003e\r\n  \u003cli\u003e\n\u003cstrong\u003e600+ Cycle Durability:\u003c\/strong\u003e Excellent performance retention over time\u003c\/li\u003e\r\n  \u003cli\u003e\n\u003cstrong\u003eReady for Cold or Heat:\u003c\/strong\u003e Works from -30°C to 75°C\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\u003cbr\u003e\r\n\u003cb\u003eSPECIFICATIONS\u003c\/b\u003e\r\n\u003cdiv class=\"table-wrapper\"\u003e\u003ctable\u003e\r\n\u003ctbody\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003eManufacturer:\u003c\/td\u003e\r\n\u003ctd\u003eAmpace\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003eModel:\u003c\/td\u003e\r\n\u003ctd\u003eJP40\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003eSize:\u003c\/td\u003e\r\n\u003ctd\u003e21700\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003ePositive Terminal:\u003c\/td\u003e\r\n\u003ctd\u003eFlat Top\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003eNominal Capacity:\u003c\/td\u003e\r\n\u003ctd\u003e4000mAh\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003eContinuous Discharge Rating (max):\u003c\/td\u003e\r\n\u003ctd\u003e 60A (No Temperature Cut-off) \/ 70A (With Temperature Cut-off)\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003eNominal Voltage:\u003c\/td\u003e\r\n\u003ctd\u003e3.7V\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003eMaximum Voltage:\u003c\/td\u003e\r\n\u003ctd\u003e4.2V\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003eDischarge cut-off Voltage:\u003c\/td\u003e\r\n\u003ctd\u003e2.5V\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003eProtected:\u003c\/td\u003e\r\n\u003ctd\u003eNO, UNPROTECTED.\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003ePulse Discharge (5s):\u003c\/td\u003e\r\n\u003ctd\u003e140A\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003eStandard Charge Current:\u003c\/td\u003e\r\n\u003ctd\u003e4A\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003eFast Charge Current:\u003c\/td\u003e\r\n\u003ctd\u003e8A\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003eCycle Life:\u003c\/td\u003e\r\n\u003ctd\u003e≥2400mAh after 600 cycles @ 30A \/ ≥2400mAh after 400 cycles @ 40A\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003eOperating Temperature:\u003c\/td\u003e\r\n\u003ctd\u003e-30°C to 75°C (Discharge) \/ 0°C to 60°C (Charge)\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003eRechargeable:\u003c\/td\u003e\r\n\u003ctd\u003eYes\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003eApprox. Dimensions:\u003c\/td\u003e\r\n\u003ctd\u003e21.1mm x 70.1mm\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003eApprox. Weight:\u003c\/td\u003e\r\n\u003ctd\u003e68g\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003ctr\u003e\r\n\u003ctd\u003eCountry of Origin:\u003c\/td\u003e\r\n\u003ctd\u003eChina\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003ctr\u003e\r\n\u003c\/tr\u003e\n\u003ctr\u003e\r\n\u003ctd\u003eData Specification Sheet:\u003c\/td\u003e\r\n\u003ctd\u003e\u003ca title=\"Ampace JP40 21700 Li-ion Battery Datasheet\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0670\/0125\/3945\/files\/Ampace_JP40_21700_Li.pdf?v=1755641185\" target=\"_blank\" rel=\"noopener\" aria-describedby=\"a11y-new-window-message\"\u003eAmpace JP40 21700 Li-ion Battery Datasheet\u003c\/a\u003e\u003c\/td\u003e\r\n\u003c\/tr\u003e\r\n\u003c\/tbody\u003e\r\n\u003c\/table\u003e\u003c\/div\u003e\r\n\u003cbr\u003e\r\n","brand":"Ampace","offers":[{"title":"Default Title","offer_id":52865120796982,"sku":"AMPACE-JP40","price":5.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0721\/2761\/1190\/files\/AMPACE-JP40.jpg?v=1755716493"}],"url":"https:\/\/18650battery.com\/collections\/ampace-21700-batteries.oembed","provider":"18650Battery","version":"1.0","type":"link"}