This pack of four eneloop pro AA Rechargeable Ni-MH Batteries provide 2450mAh and come pre-charged and ready to use. They are not subject to any memory effect so you can charge them up to 500 times whether they are fully or partially drained.
After one year of storage the eneloop pro batteries maintain 85% of their charge. These batteries provide high-power performance in temperatures down to -4°F.