4S 40A 14.8V 16.8V 18650 Charger Li-ion Lithium Battery Protection Board PCB BMS Lipo Cell Module

Specification: Parameter Details Battery Type Li-ion / LiPo (18650 or similar) Configuration 4S (4 cells in series) Nominal Voltage 14.8V Maximum Charge Voltage 16.8V (4.2V × 4 cells) Rated Charge Current 20A (recommended), max 40A Rated Discharge Current 40A (continuous), peak 60A Overcharge Detection Voltage 4.25V ± 0.05V Overcharge Release Voltage 4.15V ± 0.05V Over-discharge Detection 2.8V ± 0.1V Over-discharge Release 3.0V ± 0.1V Overcurrent Protection 50A–60A (typical) Short Circuit Protection Yes, auto recovery or manual reset Balancing Function Yes (passive balancing to equalize cell voltages) Balance Start Voltage ~4.2V per cell Internal Resistance < 100 mΩ Temperature Protection No (unless external module is added) Board Dimensions Approx. 65mm × 45mm × 8mm Connector Type 5-pin JST or solder pads for cell connections Application E-bikes, scooters, tools, solar storage, DIY packs   Features: Designed for 4-cell lithium-ion or