This 4-pack of Eneloop AAA Rechargeable Ni-MH Batteries from Panasonic have a typical capacity of 800mAh and minimum capacity of 750mAh, and come factory-charged using solar energy, so they are ready-to-use right out of the box. They hold 70% of their charge for up to 10 years, and can be recharged up to 2,100 times.