Turn off or unplug the Selmar Turbo 4 from the wall outlet first.
Modern smart chargers automatically switch to a low-voltage "trickle" or "float" mode when a battery is full. The Selmar Turbo 4 does not have this feature. selmarturbo4batterychargerinstructions
Built-in protection against reverse polarity and electrical overloads. Pre-Charging Safety Checklist Turn off or unplug the Selmar Turbo 4