AA size Nickel-Metal Hydride (Ni-MH) 1.5volts, 2500mAh charges upto a 1000 times. 4 Batteries in a Pack AA size Nickel-Metal Hydride (Ni-MH) 1.5volts, 2500mAh charges upto a 1000 times. Commonly used in portable computers, Digital cameras, portable drills, and other small battery-powered devices, Far out performs alkaline batteries in high drain applications. NiMH batteries
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