These Panasonic Ready to Use Rechargeable AA batteries as the name suggests come fully charged and ready to use. They also stay charged longer than most other rechargeable AA batteries. These new Panasonic Ready to Use rechargeable AA batteries retain 80% of their charge after 12 months without use, therefore offering 365 days standby power. With a capacity of 1900mAh, these Panasonic Rechargeable AA batteries are ideal for a large range of devices. Ideal for digital cameras, remote control toys, wireless mouse and wireless keyboard, electric toothbrush or Xbox and Wii remote controls. These Panasonic Rechargeable AA batteries are NiMH 1.2V. Ready to USe is the new name for Evolta Rechargeable Batteries.