NiMH Rechargeable AA Battery is the newest, most powerful and durable type of rechargeable batteries. Quick and easy to charge, they last for approximately 1,000 charge/discharge cycles (four to five years of normal use). Particularly well suited for devices requiring high-energy development over a short time, these batteries have far higher power reserves than standard alkaline manganese batteries. Ideal for everything from digital cameras and portable cassette players to CD players to notebook computers.