Ready-2-Go Battery, AA, 8 Pack, 1.2V 2150mAh, Nickel-Metal Hydride... Pre charged and ready to use right out of the package like Alkaline Batteries; May be recharged up to a 1000 times making them economical and environment friendly; Slow discharge rate. Batteries remain 85% full after one year; Ideal for CD Players, MP3 Players, Remotes, Toys, Wireless Devices, Wireless Guitar, and more; R2G Nickel-Metal Hydride - 1.2V 2150mAh; Use any NiMH battery charger.