... test charge discharge, universal, portable... RFNT3 Laptop Battery Tester Function:*Charge: Active, pre-charge, constant current and constant voltage ... status*With charge-key, discharge-key, backlight-key and function-key*Pre-charge, fast charge and constant voltage charge for ... + 8.8h = disc + pause + chg Auto quit time for function menu: 10s LCD display to show the parametersTest and ChargeDischarge ...