"These Duracell Rechargeable AAA NiMH Batteries batteries are charged and ready to use right out of the package. Ideal for use with cameras and more. Volts 1.2, Batteries qty. 4, Battery Amp/Hour 1,000 mAh, Battery Type Cylindrical rechargeable, Temperature Range F -14-122. Last up to 5 times longer than alkaline batteries Will hold a charge for up to one year while not in use NIMH technology has no memory effect, allowing it to be recharged hundreds of times Works with most NiMH battery chargers"