This 3 LED Dynamo Flashlight never needs batteries. Turn on either 1 LED or 3 LEDs for just the amount of light you need. Turning the hand-crank for 1 minute offers 30 minutes of light. This flashlight uses a rechargeable Ni-MH cell: 3.6V, 80mAH. Under normal conditions, Ni-MH batteries can be recharged fully 500 times.