{"product_id":"new-4s-40a-20a-12-8v-14-4v-32650-32700-lifepo4-battery-bms-for-solar-panel-and-electric-boat-uninterrupted-power-supply-12v","title":"4S LiFePO4 BMS Board 12.8V 20A\/40A with Balance for 32650 32700","description":"\u003cp\u003eA 4S LiFePO4 pack in a solar or 12V backup build needs a board that keeps the four cell groups in balance. This protection board handles 20A or 40A continuous discharge and is built for 32650 and 32700 cells. Choose it for a 12.8V pack you assemble yourself.\u003c\/p\u003e\u003ch2\u003eWhat a 4S LiFePO4 board does in a 12.8V pack\u003c\/h2\u003e\u003cp style=\"margin:0 0 6px 0\"\u003e✅ \u003cstrong\u003eTwo current ratings to match your load\u003c\/strong\u003e Choose the 20A board for lighter draws or the 40A version for heavier loads, keeping airflow around it.\u003c\/p\u003e\u003cp style=\"margin:0 0 6px 0\"\u003e✅ \u003cstrong\u003eCell balancing across all four groups\u003c\/strong\u003e The board balances the four LiFePO4 groups so they stay closer together through repeated charge and discharge cycles.\u003c\/p\u003e\u003cp style=\"margin:0 0 6px 0\"\u003e✅ \u003cstrong\u003eFits a pack you build yourself\u003c\/strong\u003e Built for 32650 and 32700 cells, so a DIY 12.8V pack for a solar setup or a boat has a matching board.\u003c\/p\u003e\u003cp style=\"margin:0 0 6px 0\"\u003e✅ \u003cstrong\u003eStraightforward wiring order\u003c\/strong\u003e Wire the board in the marked 0V, 3.6V, 7.2V, 10.8V, 14.4V order, as the wiring map requires.\u003c\/p\u003e\u003cp style=\"margin:0 0 6px 0\"\u003e✅ \u003cstrong\u003eNo cells or charger in the box\u003c\/strong\u003e You receive the protection board; cells, charger and battery pack are not included, so order those separately for your build.\u003c\/p\u003e\u003cp\u003eThe board sits between the cells and whatever the pack feeds: a solar charge setup, a 12V uninterruptible supply or the bank on an electric boat. It takes four groups of 3.2V LiFePO4 cells in series and adds the protection and balancing layer for 32650 or 32700 builds.\u003c\/p\u003e\u003cp\u003eWiring follows the order printed on the board: 0V, 3.6V, 7.2V, 10.8V, 14.4V. Connect in that sequence, keep the leads short and never short the terminals on purpose. Charging voltage sits between 14.4V and 16V.\u003c\/p\u003e\u003cp\u003eTwo current versions are offered. The 20A board suits a light load, while the 40A version is for builds that pull more; where airflow around the board is poor, the load should be reduced.\u003c\/p\u003e\u003cp\u003eNothing else is in the box: no cells, no charger, no assembled pack. If you are building a 12.8V pack from 32650 or 32700 cells, order the board together with the cells and the charger.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTechnical details\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eConfiguration: 4S LiFePO4 protection board with balance\u003c\/li\u003e\n\u003cli\u003eNominal voltage: 12.8V\u003c\/li\u003e\n\u003cli\u003eCharging voltage: 14.4V to 16V\u003c\/li\u003e\n\u003cli\u003eContinuous discharge current: 20A or 40A, depending on version\u003c\/li\u003e\n\u003cli\u003eBalancing: Built in\u003c\/li\u003e\n\u003cli\u003eCell size: 3.2V LiFePO4 cells, including 18650, 26650, 32650 and 32700\u003c\/li\u003e\n\u003cli\u003eWiring sequence: 0V, 3.6V, 7.2V, 10.8V, 14.4V\u003c\/li\u003e\n\u003cli\u003eCertification: CE\u003c\/li\u003e\n\u003cli\u003ePackage contents: 1 x 4S BMS board\u003c\/li\u003e\n\u003cli\u003eNot included: Battery cells, charger and assembled battery pack\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg style=\"margin-bottom:10px\" class=\"detail-desc-decorate-image\" src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/He7e7b9d2154c4f92af6b051fd73215c3h.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"margin-bottom:10px\" class=\"detail-desc-decorate-image\" src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/H021debcd09c045d7b7b388f6ebc0b531A.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"margin-bottom:10px\" class=\"detail-desc-decorate-image\" src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/H3e0c7a79cdd240e3b5b0e3d9510815e4U.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"margin-bottom:10px\" class=\"detail-desc-decorate-image\" src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/H695c3c100e9143abada4d07e7d642a19Q.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"margin-bottom:10px\" class=\"detail-desc-decorate-image\" src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/He73d9e6a73d841b7a3aaa95c198556d1d.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"margin-bottom:10px\" class=\"detail-desc-decorate-image\" src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/H4a730755f24a4ccbb154eb6b4f93a8d16.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"margin-bottom:10px\" class=\"detail-desc-decorate-image\" src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Hedfaec5836bf4416aaf15750cd7cf837q.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"margin-bottom:10px\" class=\"detail-desc-decorate-image\" src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/H9532339ff5be41c2b5400aae04e73e1fS.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"margin-bottom:10px\" class=\"detail-desc-decorate-image\" src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Hcb36e30b539d411d9d384323833c4794G.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg style=\"margin-bottom:10px\" class=\"detail-desc-decorate-image\" src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Ha49207faccd549f29b18dd6c60550554x.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003eCheck your pack's cell size and current draw, then pick the 20A or 40A board that fits.\u003c\/p\u003e\u003cp\u003eSee more: \u003ca href=\"https:\/\/spy-shop.com\/collections\/power-energy\"\u003eexplore more power and energy components\u003c\/a\u003e\u003c\/p\u003e","brand":"Spy-shop.com","offers":[{"title":"4S-12.8V-20A-Balance","offer_id":64123967275338,"sku":"1005001987221981-4S-12.8V-20A-Balance","price":25.24,"currency_code":"EUR","in_stock":true},{"title":"4S-40A-Balance--NEW","offer_id":64123967308106,"sku":"1005001987221981-4S-40A-Balance--NEW","price":32.35,"currency_code":"EUR","in_stock":true},{"title":"4S40A-Balance-WIRE","offer_id":64123967340874,"sku":"1005001987221981-4S40A-Balance-WIRE","price":35.51,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0764\/5980\/2954\/files\/H021debcd09c045d7b7b388f6ebc0b531A.webp?v=1793145383","url":"https:\/\/spy-shop.com\/da\/products\/new-4s-40a-20a-12-8v-14-4v-32650-32700-lifepo4-battery-bms-for-solar-panel-and-electric-boat-uninterrupted-power-supply-12v","provider":"Spy-shop.com","version":"1.0","type":"link"}