Energizer Value Charger with 2 AA Rechargeable AA Batteries for AA / AAA Nimh Batteries CHVCWB2 is perfect device to have when you don't have time to spare and want to charge your nimh batteries overnight. The CHVCWB2 Energizer battery charger charges up to 4 AAA Nimh batteries and 4 AA Nimh batteries just in time to use your Digital Camera Binoculars, Digital Cameras, Digital Navigation, Flashlights, Laser Sights, Night Vision, Radar Guns, Range Finders, and Red Dot Sights. In case you forget that the Energizer CHVCWB2 charger is plugged in over an extended period of time, the Energizer CHVCWB2 has a built in safety timer and temperature sensor that will prevent the rechargeable batteries from over heating and possibly leaking. Nimh batteries by Energizer are the most economical batteries to recycle making them better for the environment. they also do not contain highly toxic cadium but are suitable replacements for Alkaline batteries in most devices.