{"product_id":"bms-1-5a-3s-4s-5s-6s-7s-8s-14s-17s-21s-li-ion-lifepo4-lto-lithium-battery-active-equalizer-balancer-board-balance-capacitor","title":"1.5 A Active Battery Balancer Board, 3S to 21S Lithium","description":"\u003cp\u003eCells inside a pack drift apart as they age, and a passive board only burns off the difference as heat. This capacitive balancer moves charge between cells, with nine series versions from 3S to 21S and up to 1.5 A of balancing current. It suits pack builders, e-bike repairs and bench maintenance.\u003c\/p\u003e\u003ch2\u003eLevel Pack Cells Instead of Draining the High Ones\u003c\/h2\u003e\u003cp style=\"margin:0 0 6px 0\"\u003e✅ \u003cstrong\u003eBring a drifted pack back\u003c\/strong\u003e Add one to a pack whose cells have drifted, then level them before the next charge.\u003c\/p\u003e\u003cp style=\"margin:0 0 6px 0\"\u003e✅ \u003cstrong\u003eCharge moves, not heat\u003c\/strong\u003e The capacitive circuit shifts energy between cells and runs cool, unlike a resistor board.\u003c\/p\u003e\u003cp style=\"margin:0 0 6px 0\"\u003e✅ \u003cstrong\u003eNine series versions\u003c\/strong\u003e Choose 3S, 4S, 5S, 6S, 7S, 8S, 14S, 17S or 21S to match your pack.\u003c\/p\u003e\u003cp style=\"margin:0 0 6px 0\"\u003e✅ \u003cstrong\u003ePlug-in lead supplied\u003c\/strong\u003e The matching lead ends in a plug, so a bench test is wired in minutes.\u003c\/p\u003e\u003cp style=\"margin:0 0 6px 0\"\u003e✅ \u003cstrong\u003eKeeps your protection board\u003c\/strong\u003e It runs independently of the BMS, so an existing protection board stays where it is.\u003c\/p\u003e\u003cp\u003eOn the bench, the board takes the matching lead and works on its own: connect it across the pack, leave it to equalise, and disconnect when the cells settle. Nothing needs a phone, a laptop or a settings file, which is what makes it useful in a workshop with several packs on the go.\u003c\/p\u003e\u003cp\u003eThe 1.5 A figure is a ceiling rather than a fixed rate. Balancing current falls as the voltage difference between cells closes and as resistance in the wiring rises, so a badly drifted pack draws more at the start and almost nothing near the end. That is normal behaviour for this circuit, not a fault.\u003c\/p\u003e\u003cp\u003eMatch the series count to the pack rather than the other way round: the nine versions cover 3S, 4S, 5S, 6S, 7S, 8S, 14S, 17S and 21S groups, and the board is wired across the whole string. It equalises cells and does not replace a protection board or a charger.\u003c\/p\u003e\u003cp\u003eIt can sit inside a battery pack or outside it for maintenance work, so the same board can serve a build during assembly and then a repair job months later.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTechnical details\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFunction: Active capacitive cell equalisation\u003c\/li\u003e\n\u003cli\u003eSeries versions: 3S, 4S, 5S, 6S, 7S, 8S, 14S, 17S, 21S\u003c\/li\u003e\n\u003cli\u003eMaximum balancing current: 1.5 A, varying with cell voltage difference and wiring resistance\u003c\/li\u003e\n\u003cli\u003eBattery types: LiFePO4, Li-ion (ternary) and LTO packs\u003c\/li\u003e\n\u003cli\u003eConnection: Matching lead with plug, 30 cm\u003c\/li\u003e\n\u003cli\u003eInstallation: Inside a pack or external for maintenance\u003c\/li\u003e\n\u003cli\u003eQuantity: 1 board\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg class=\"detail-desc-decorate-image\" src=\"https:\/\/ae01.alicdn.com\/kf\/Sc6ad5ffb5d254abd9984e75500af89c7g.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S066a3c486df543aeaca8affa6dc0ab363.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S992c53204e104748bf6623dc07d4c63f5.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S4f1a1ee569a64315b8f6c4c55643096b2.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S6819bee9ca294af29e3315ba80526fd6A.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S190ac87016384aedb93b3f3d8dc7241aH.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S9714f09c799641ea8de9d038eadc328bV.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sf662f58307a14bcab2af75edfa48e690Q.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S7983e8e84d4a4bf385a7ce5d3f419d53L.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S175c2fd46375410c9309c19cf867d3fdU.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sd55d5592f2334833b07c7f0419eb2c29E.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S4d569200c2bd48aca67b471bf6611da9j.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sd55ebe73511a44898a0fdcd46c7948d7s.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S3baba2996f6042f09da3b549887f256cM.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S27059582ac5c4a88b3191cb252f91d96e.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S769aa038588c4dbb89a73dc97c46ea8fm.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S3f672168bab14a87bf92c418932a78fcK.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sab27427c6bd647e19d5f9e811c136e967.png\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S6877b8056653403791783e36a0bcf7bcy.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg class=\"detail-desc-decorate-image\" src=\"https:\/\/ae01.alicdn.com\/kf\/S5071cfdbcaa5475292bb70ffd3707b9e0.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sd1501a4d28b845458d59a3415f3694aaU.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003cp\u003eMatch the series count to your pack and keep the cells level between charges.\u003c\/p\u003e\u003cp\u003eSee more: \u003ca href=\"https:\/\/spy-shop.com\/collections\/power-energy\"\u003eexplore more power and battery accessories\u003c\/a\u003e\u003c\/p\u003e","brand":"Spy-shop.com","offers":[{"title":"3S","offer_id":64123909341514,"sku":"1005005827876691-3S","price":23.66,"currency_code":"EUR","in_stock":true},{"title":"14S","offer_id":64123909374282,"sku":"1005005827876691-14S","price":54.47,"currency_code":"EUR","in_stock":true},{"title":"8S","offer_id":64123909407050,"sku":"1005005827876691-8S","price":37.09,"currency_code":"EUR","in_stock":true},{"title":"21S","offer_id":64123909439818,"sku":"1005005827876691-21S","price":68.69,"currency_code":"EUR","in_stock":true},{"title":"17S","offer_id":64123909472586,"sku":"1005005827876691-17S","price":60.79,"currency_code":"EUR","in_stock":true},{"title":"5S","offer_id":64123909505354,"sku":"1005005827876691-5S","price":26.82,"currency_code":"EUR","in_stock":true},{"title":"4S","offer_id":64123909538122,"sku":"1005005827876691-4S","price":26.03,"currency_code":"EUR","in_stock":true},{"title":"7S","offer_id":64123909570890,"sku":"1005005827876691-7S","price":30.77,"currency_code":"EUR","in_stock":true},{"title":"6S","offer_id":64123909603658,"sku":"1005005827876691-6S","price":29.19,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0764\/5980\/2954\/files\/S066a3c486df543aeaca8affa6dc0ab363.webp?v=1793354360","url":"https:\/\/spy-shop.com\/el\/products\/bms-1-5a-3s-4s-5s-6s-7s-8s-14s-17s-21s-li-ion-lifepo4-lto-lithium-battery-active-equalizer-balancer-board-balance-capacitor","provider":"Spy-shop.com","version":"1.0","type":"link"}