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What Is a 3S/4S Li-ion Battery BMS and How Does It Work

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A 3S/4S Li-ion Battery Management System (BMS) protects lithium-ion battery packs (like 18650 cells) from overcharge, over-discharge, and overheating. It balances cell voltages in 11.1V-16.8V configurations and supports 20A-60A currents, making it ideal for power tools, drones, and DIY projects …