Important reminder: the whole charging protection board has a protection function, if your battery protection board, before use, please remove the battery protection board, otherwise it may cause the trial is not normal.Module performance: The input voltage: 4.35-6 v (recommended voltage 5 v) Charge cut-off voltage: 4.2 V + / – 1% Maximum charging current output: 1000 ma The battery overcharge protection voltage: 4.28 V Battery overcharge lifting voltage: 4.00 V The battery discharge protection voltage: 3.0 V Battery discharge termination voltage: 3.2 V Battery: over-current protection current 3 a The board size: about 2.5 * 1.65 CM Light state: no load the light not bright, red light for recharging, is full of green light.