HA02-12V battery equalizer is used for 12V lead-acid battery or lifepo4 battery which is connected in series to keep battery voltage balance.
(Gel/Flood/AGM lead-acid batteries alll are ok) When 4 connected batteries are in charging/discharging/free status. The battery voltage may become
different. One battery voltage is high and one is low. The battery equalizer will balance the voltage among batteries when it detects there are 20mV
between 2 batteries.It will shunt current from one battery with higher voltage to the other batteries with lower voltage.Until their voltage almost
becomes the same. This will improve battery's performance and extent battery's life time.