{"product_id":"3s-12-6v-40a-li-ion-battery-bms-protection-board-without-balance-hw-287","title":"3S 12.6V 40A Li-ion Battery BMS Protection Board without Balance (HW-287)","description":"\u003ch5\u003eOverview \u0026amp; Features\u003c\/h5\u003e\n\u003cp\u003eWhen assembling custom 12.6V battery packs for high-drain applications, basic cell protection is essential to prevent catastrophic failure. The \u003cstrong\u003e3S 12.6V 40A Li-ion Battery BMS Protection Board (HW-287)\u003c\/strong\u003e provides robust, heavy-duty monitoring for 3-series lithium-ion and lithium-polymer arrays.\u003c\/p\u003e\n\n\u003cp\u003eAvailable at Tomson Electronics, this module is engineered to handle up to 40 Amps of continuous discharge current, making it highly suitable for driving electric motors and power tools with significant starting torque. It instantly safeguards your battery pack against overcharging, over-discharging, and short circuits. \u003cem\u003eNote:\u003c\/em\u003e This is the \u003cstrong\u003ewithout balance\u003c\/strong\u003e variant, meaning it does not equalize voltage between individual cells during the charge cycle. For best results, it should only be used with strictly matched, brand-new cells of identical capacity and internal resistance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAlso searched as:\u003c\/strong\u003e hw-287 bms module, 3s 40a bms without balance, 12.6v lithium ion battery protection board, 18650 bms no balance, 3 series power tool bms.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch5\u003eTechnical Specifications\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModule Type:\u003c\/strong\u003e 3S Lithium-Ion BMS (HW-287)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBalancing Function:\u003c\/strong\u003e None (Without Balance)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCharging Voltage:\u003c\/strong\u003e 12.6V to 13.6V DC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Continuous Discharge Current:\u003c\/strong\u003e 40A (Proper heat dissipation recommended for extended peak loads)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Charging Current:\u003c\/strong\u003e 20A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOvercharge Detection Voltage (per cell):\u003c\/strong\u003e 4.25V ± 0.025V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOver-discharge Detection Voltage (per cell):\u003c\/strong\u003e 2.55V ± 0.08V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtection Features:\u003c\/strong\u003e Overcharge, Over-discharge, Over-current, and Short Circuit protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Battery Chemistry:\u003c\/strong\u003e Li-Ion \/ Li-Po (3.7V Nominal, 4.2V Max per cell)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch5\u003eCommon Applications\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Tool Repair \u0026amp; Upgrades:\u003c\/strong\u003e Rebuilding 12V cordless drill and saw battery packs where high burst currents are required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRobotics \u0026amp; RC Vehicles:\u003c\/strong\u003e Safely powering high-torque mechanical drive systems and custom drone chassis.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePortable Lighting \u0026amp; Audio:\u003c\/strong\u003e Creating custom high-capacity 12V power banks for LED arrays and Bluetooth speaker amplifiers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch5\u003eFrequently Asked Questions\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What does \"without balance\" mean for my battery pack?\u003c\/strong\u003e\u003cbr\u003e\nA: A BMS without a balancing feature protects the entire pack from unsafe voltage levels and short circuits, but it does not actively drain higher-voltage cells to match lower-voltage cells during charging. It relies entirely on the cells being perfectly matched before assembly.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I use this with LiFePO4 (Lithium Iron Phosphate) cells?\u003c\/strong\u003e\u003cbr\u003e\nA: No. This board is calibrated specifically for standard Lithium-Ion\/Li-Po cells (3.7V nominal \/ 4.2V max). LiFePO4 cells have a lower voltage (3.2V nominal) and require a dedicated LiFePO4 BMS to prevent severe overcharging.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Do I need a special charger for a pack built with this BMS?\u003c\/strong\u003e\u003cbr\u003e\nA: You must use a dedicated CC\/CV (Constant Current \/ Constant Voltage) 12.6V Lithium-Ion charger. Do not use a standard 12V lead-acid battery charger, as it will damage the cells and potentially trigger the BMS protections prematurely.\u003c\/p\u003e\n\n\u003ch5\u003ePackage Includes\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e1 × 3S 12.6V 40A Li-ion Battery BMS Protection Board without Balance (HW-287)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TOMSON ELECTRONICS","offers":[{"title":"Default Title","offer_id":49511780352238,"sku":"BAT-27455","price":99.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2132\/9029\/files\/3S_40A_LI-ION_BATTERY_BMS_MODULE_12.6V_NO_BALANCE_HW_287.avif?v=1787984984","url":"https:\/\/www.tomsonelectronics.com\/products\/3s-12-6v-40a-li-ion-battery-bms-protection-board-without-balance-hw-287","provider":"Tomson Electronics ","version":"1.0","type":"link"}