This 4cells BMS with battery fuel gauge display can protect the 12.8V 10Ah/20Ah lifepo4 battery pack not over-charged, not over-discharged, short circuit protective, balancing function, etc..

And it also designed with battery fuel gauge which can display the total battery voltage, battery capacity, battery SOC, etc..

Now this BMS used on the portable power bank/UPS.

More details related this product or custom development needed, pls contact us.