The battery can be charged on the board by plugging the charger cable into the charging terminal or off the board by removing the battery from the scooter and charging separately. The battery doesnt have a memory and can be charged at any stage. For longer battery life it is recommended to be plugged in after every ride. You dont need to time the battery charge. When the battery is fully charged the charger switch to a trickle charge mode and prevents overcharging.