Energizer Recharge Smart battery charger for AA/AAA batteries with four (4) Energizer AA NiMH batteries included. It charges 2 or 4 AA or AAA NiMH rechargeable batteries. Countdown timer shows how long until batteries are charged along with battery fuel guage that shows charge status. Bad battery alert detects and shuts off charging when a non-rechargeable battery, or old rechargeable battery is inserted. Includes a large easy-to-read display. Energy Star certified.