4S 20A Li-ion & 18650 BMS Battery Protective Balance Circuit

 

4S 14.8V 20A Lithium battery Protection Board for 3.7V lithium-ion batteries of various shapes Comes with overcharge, overdischarge, overcurrent and short circuit protection. The HX-4S-20D is a low-cost, reliable and small-sized square-shaped board that can pack four 18650 cells.

 

This BMS (Battery Management System) – monitoring the status of the batteries , controlling battery charging/discharging process etc. It is a battery management system designed for Four 18650 batteries can be connected to the HX-4S-20D module at the same time.

 

The features of this charge controller include protection against short circuit (short circuit) and overdischarge (overcharge). ) is protection against. Also a feature of the module is that it turns off the power supply to the batteries when the maximum capacity of at least one battery is reached. The maximum operating current of this BMS controller is 20 A, and the quiescent current reaches up to 10 μA. The battery charge turns off when the voltage reaches 4.25 – 4.35 V, and the discharge turns off when the voltage drops to 2.3 – 3.0 V.

  

BMS Connections

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Positive(+) connection of B+ battery

B1 is the connection between battery 1 and battery 2

B2 is the connection between battery2 and battery 3

B3 connection between battery 3 and battery 4

B- negative(-) connection of battery

P+ charge / discharge positive(+) connection

P- charge / discharge negative(-) connection

 

NOTE: In case of a short circuit, you may damage the battery and circuit and cause a fire. Connecting dead batteries will also damage healthy batteries.