Lenmar R2GAAA4 R2G Ready To Go Rechargeable AAA  850 mAh Batteries (4 Pack) Chemistry: Nickel-Metal Hydride Pre-charged and ready to use right out of the package, Watt Hours: 1.02 Wh Advanced technology allows for extra long shelf-life and slow discharge rate keeps 85% of their charge after 1 year Environmentally friendly and economical - can be recharged up to 1,000 times using any NiMH charger 1 Year Warranty