Charging diagnostics provide battery state of health and charge indication Pre-charging with lower current when the battery is on low voltage Super quick charger with cooling fan Over discharge protection Over temperature protection Automatic switch charging current on different batteries CMS (charge anagement system) intelligently identifies each battery pack to provide the fastest charge time Rated voltage: 120V, 60 Hz Output voltage: 20V Input power: 95W Charge current: 4A Charge time for 2.0Ah battery: approx. 30 mins Charge time for 4.0Ah battery: approx. 1 hour