... -ion battery, NI-MH battery, Ni Cd battery, power, adapter, power bank. 2. charging and discharging functons About RFNT4 Universal ... on. It can test the voltage (V), current (A), capacity (mAh), resistance (Ω) ,power output(W) information. It can charge, dis ... keys.5. Charging consists of activate, pre-charge, constant current charge, constant voltage charge, end of charge.6. Discharging can adjust ...