{"title":"FEB - 21700","description":"","products":[{"product_id":"feb-21700-battery-cell-6500mah-13a-ultra-high-capacity-energy-cell","title":"FEB 21700 Battery Cell – 6500mAh 13A Ultra High Capacity Energy Cell","description":"\u003cdiv class=\"battery-cell-template\" style=\"--cell-accent:#16a34a; --cell-accent-soft:#dcfce7; --cell-accent-soft-border:#86efac; --cell-accent-muted:#15803d;\"\u003e\r\n  \u003cstyle\u003e\n    .battery-cell-template { font-family: Arial, Helvetica, sans-serif; color: #1f2937; line-height: 1.6; border: 1px solid #e5e7eb; border-top: 6px solid var(--cell-accent); border-radius: 18px; overflow: hidden; background: #fff; }\n    .battery-cell-template-inner { padding: 24px; }\n    .battery-cell-header { background: linear-gradient(135deg, var(--cell-accent-soft), #ffffff 72%); border: 1px solid var(--cell-accent-soft-border); border-radius: 16px; padding: 18px; margin-bottom: 18px; }\n    .battery-cell-header h2 { margin: 0 0 12px; line-height: 1.3; color: #111827; }\n    .battery-cell-badge, .battery-cell-mini-badge { display: inline-flex; align-items: center; border-radius: 999px; font-weight: 700; margin: 0 6px 6px 0; }\n    .battery-cell-badge { padding: 8px 12px; background: var(--cell-accent); color: #fff; font-size: 13px; }\n    .battery-cell-mini-badge { padding: 7px 10px; border: 1px solid var(--cell-accent-soft-border); background: #fff; color: #111827; font-size: 12px; }\n    .battery-cell-box { border: 1px solid var(--cell-accent-soft-border); background: linear-gradient(135deg, var(--cell-accent-soft), #ffffff 78%); border-radius: 16px; padding: 16px; margin: 18px 0; }\n    .battery-cell-box h3 { margin: 0 0 10px; color: #111827; }\n    .battery-cell-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-top: 12px; }\n    .battery-cell-grid div { border: 1px solid #e5e7eb; border-radius: 12px; padding: 12px; background: #fff; }\n    .battery-cell-spec-table { width: 100%; border-collapse: collapse; margin: 12px 0 18px; border: 1px solid #e5e7eb; }\n    .battery-cell-spec-table td { border-bottom: 1px solid #e5e7eb; padding: 10px 12px; vertical-align: top; }\n    .battery-cell-spec-label { width: 38%; background: #f9fafb; color: #111827; }\n    .battery-cell-spec-value a { color: var(--cell-accent-muted); font-weight: 700; }\n    .battery-cell-warning { border: 1px solid #fecaca; background: #fff1f2; color: #7f1d1d; border-radius: 16px; padding: 16px; }\n    @media (max-width: 640px) { .battery-cell-template-inner { padding: 16px; } .battery-cell-grid { grid-template-columns: 1fr; } }\n  \u003c\/style\u003e\r\n  \u003cdiv class=\"battery-cell-template-inner\"\u003e\r\n    \u003cdiv class=\"battery-cell-header\"\u003e\r\n      \u003ch2\u003eFEB 21700G 6500mAh Battery Cell\u003c\/h2\u003e\r\n      \u003cspan class=\"battery-cell-badge\"\u003eLow Current Cell\u003c\/span\u003e\r\n      \u003cspan class=\"battery-cell-mini-badge\"\u003eHigh Capacity Cell\u003c\/span\u003e\r\n      \u003cspan class=\"battery-cell-mini-badge\"\u003e13A max current basis\u003c\/span\u003e\r\n      \u003cp\u003eBest when runtime is the priority and each cell stays within the datasheet current rating.\u003c\/p\u003e\r\n    \u003c\/div\u003e\r\n\r\n    \u003cdiv class=\"battery-cell-box\"\u003e\r\n      \u003ch3\u003e\u003cstrong\u003eQuick Cell Guide\u003c\/strong\u003e\u003c\/h3\u003e\r\n      \u003cdiv class=\"battery-cell-grid\"\u003e\r\n        \u003cdiv\u003e\n\u003cstrong\u003ePower level:\u003c\/strong\u003e\u003cbr\u003eLow Current Cell\u003c\/div\u003e\r\n        \u003cdiv\u003e\n\u003cstrong\u003eRuntime level:\u003c\/strong\u003e\u003cbr\u003e6500 mAh \/ 3.6V\u003c\/div\u003e\r\n        \u003cdiv\u003e\n\u003cstrong\u003eBest use:\u003c\/strong\u003e\u003cbr\u003eBest when runtime is the priority and each cell stays within the datasheet current rating.\u003c\/div\u003e\r\n        \u003cdiv\u003e\n\u003cstrong\u003eImportant:\u003c\/strong\u003e\u003cbr\u003eDesign with current headroom. Do not build at the edge of the datasheet rating without checking heat, BMS limits, and current sharing.\u003c\/div\u003e\r\n      \u003c\/div\u003e\r\n    \u003c\/div\u003e\r\n\r\n    \u003cdiv class=\"battery-cell-box\"\u003e\r\n      \u003ch3\u003e\u003cstrong\u003eTested by BatteryRealData\u003c\/strong\u003e\u003c\/h3\u003e\r\n      \u003cp\u003eBatteryRealData link will be added when public tests are available.\u003c\/p\u003e\r\n      \u003cp\u003e\u003ca href=\"https:\/\/batteryrealdata.com\/cells\/\" target=\"_blank\" rel=\"noopener\"\u003eSee full BatteryRealData test results\u003c\/a\u003e\u003c\/p\u003e\r\n    \u003c\/div\u003e\r\n\r\n    \u003ch3\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/h3\u003e\r\n    \u003ctable class=\"battery-cell-spec-table\"\u003e\r\n      \u003ctbody\u003e\r\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003eFEB\u003c\/td\u003e\n\u003c\/tr\u003e\r\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e21700G\u003c\/td\u003e\n\u003c\/tr\u003e\r\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eSize \/ Format\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e21700 cylindrical cell\u003c\/td\u003e\n\u003c\/tr\u003e\r\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eChemistry\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003eLi-ion\u003c\/td\u003e\n\u003c\/tr\u003e\r\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eRated Capacity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e6500 mAh\u003c\/td\u003e\n\u003c\/tr\u003e\r\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eNominal Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e3.6V\u003c\/td\u003e\n\u003c\/tr\u003e\r\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eMaximum Charge Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e4.2V\u003c\/td\u003e\n\u003c\/tr\u003e\r\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eDischarge Cutoff Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e2.5V\u003c\/td\u003e\n\u003c\/tr\u003e\r\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eMaximum Charge Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e4.55A Max (0.7C)\u003c\/td\u003e\n\u003c\/tr\u003e\r\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eMaximum Discharge Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e13A Continuous\u003c\/td\u003e\n\u003c\/tr\u003e\r\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eInternal Resistance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e≤25mΩ\u003c\/td\u003e\n\u003c\/tr\u003e\r\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e75g\u003c\/td\u003e\n\u003c\/tr\u003e\r\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003eDiameter 21.65+\/-0.2 mm; height 70.95+\/-0.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\r\n\u003ctr\u003e\n\u003ctd class=\"battery-cell-spec-label\"\u003e\u003cstrong\u003eCycle Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"battery-cell-spec-value\"\u003e500 cycles \u0026gt;=70% of first-cycle capacity.\u003c\/td\u003e\n\u003c\/tr\u003e\r\n      \u003c\/tbody\u003e\r\n    \u003c\/table\u003e\r\n\r\n    \u003cdiv class=\"battery-cell-warning\"\u003e\r\n      \u003ch3\u003e\u003cstrong\u003eSafety Warning\u003c\/strong\u003e\u003c\/h3\u003e\r\n      \u003cp\u003eUse only in properly designed battery packs with correct BMS protection, insulation, fusing, current sharing, and thermal management. These are unprotected lithium-ion cells for experienced builders.\u003c\/p\u003e\r\n      \u003cp\u003eManufacturer maximum ratings are limits, not automatic DIY500AMP recommendations for long-term pack design.\u003c\/p\u003e\r\n    \u003c\/div\u003e\r\n  \u003c\/div\u003e\r\n\u003c\/div\u003e\r\n","brand":"FEB","offers":[{"title":"Default Title","offer_id":42624877330503,"sku":"DIY-42624877330503","price":6.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0588\/8055\/7127\/files\/feb-21700-6500mah-lithium-ion-battery-cell-upright-and-side-view.jpg?v=1774985274"}],"url":"https:\/\/diy500amp.com\/collections\/feb-21700.oembed","provider":"DIY500AMP.COM","version":"1.0","type":"link"}