Energizer aaa nimhrechargeable battery energizer 638628 the energizer 638628 is an extreme nimh cell battery in the popular size of aaa it can be recharged to full power at any time using a broad range of chargers since the cell is rechargeable up to 500 times it is a good economic and environmental choice the battery is ideal in high drain devices such as portable cd players mp3 players remote controlled toys hand held games palmtop computers or any time you want to replace your stan