"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, Battery Amp/Hour 850 mAh, Battery Type Cylindrical rechargeable, Batteries qty. 4, 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"