Fully-sealed rechargeable battery. Supplied complete with 240v charger,which connects into an external plug on the handle unit. The NiMHbattery is resistant to memory, and over-charging, and should last 500cycles. A red light indicates charging and a green light indicatescharging is complete. A full charge from flat will take 8-10 hours.Weight 600gm. NB: For optimum battery life, run fully flat occasionally,and try not to continually over-charge.