GP ReCyko+ Pro Professional is the most ideal battery. Being pre-charged and staying powerful for over five years (when not in use), it can be used for all possible devices. They can be charged over 1,500 times, definitely a very environmental friendly and cost conscious choice.
• GP ReCyko+ Rechargeable battery
• Ni-MH (Nickel Metal Hydride) chemistry
• AAA size
• Rated capacity 800mAh
• Nominal voltage 1.2V
• Gross weight ~14g