These Panasonic EVOLTA Rechargeable AAA batteries come fully charged and ready to use. They also stay charged longer than most other rechargeable AAA batteries. These new Panasonic EVOLTA rechargeable AA batteries retain 80% of their charge after 12 months without use, therefore offering 365 days standby power. With a capacity of 750mAh, these Panasonic Rechargeable Evolta AAA batteries are ideal for a large range of devices. Ideal for a remote control toy, MP3 player, wireless keyboard or a wireless mouse. These Panasonic rechargeable Evolta AAA batteries are NiMH 1.2V.