Panasonic BK-4MCCA12BA Brand New The Panasonic BK-4MCCA is a 'AAA' size Ni-MH pre-charged rechargeable battery. This battery has a typical capacity of 800mAh, and come factory-charged using solar energy, so it is ready-to-use right out of the box. It can hold 70% of their charge for up to 10 years, and can be recharged up to 2100 times. Ideally designed for all household products including flashlights, wireless gaming devices, digital camera flash units, wireless mouse and keyboards. BK-4MCCA Features 'AAA' size NiMH Battery Rechargeable up to 2100x Advanced Rechargeable Battery Technology Holds 70% of Charge for 10 Years Pre-Charged Ready to Use Battery Capacity Typical 800 mAh Minimum 750 mAh Low Self Discharge No Memory Effect Long Storage Life Work in Extreme Temperatures Functional Down to 4?F