Hello friend, today’s project is an exciting project. You might not have seen such a project before. Today I will show a device in which I will test the actual capacity of the battery using the ZB2L3 module Along with this, I will modify this module and add 2-3 more features to it, and with this module you will get 2 pcs 7.5-ohm resistor for battery capacity testing. The capacity of the battery is checked by discharging the current through this resistor which does not happen with the constant current method. But today we will know how to add constant current features to this ZB2L3 model, And you will be able to adjust the constant current 10mA-2000mA accurately, also you will be able to charge the battery from the same device, You will be able to adjust the charging current from 100mA to 1200mA. Check all the features below