This replacement charger a genuine OEM sourced item that is designed for use with lack and Decker cordless drill drivers. It connects to a standard U.S. outlet allowing user to charge batteries. Please note that a weak or defective battery can damage the charger. Weak batteries are batteries with bad cells. These type of batteries will no...Read moret hold a charge. It will send a message to the charger to keep charging. This will eventually cause the charger to overheat and potentially smoke. This durable plastic charger is sold individually.