4S 30A BMS protection board. 4S means 4 battery or 14.8v voltage. 

The battery charge is switched off when the each battery voltage reaches 4.25 – 4.35 V, and the discharge when the voltage drops to 2.3 – 3.0 V.  This BMS module comes with Over charge protection, Low discharge protection. 

4s30A BMS Protection Board


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