Intelligent cell sensor for valve regulated lead acid(VRLA) battery and lead carbon battery, measuring the cell voltage, internal impedance and internal temperature (from negative pole).

The cell sensors communicate with each other through DL-BUS protocol via RJ11 cable.

LED breathing indicator shows green when everything goes well. It shows red when cell voltage/impedance/temperature/SOC is over thresholds. Then the faulty batteries can be found very quickly.