These reliable AA Rechargeable NiMH Batteries from Ansmann are built for durability and long life, and can be recharged up to 1000 times. They are designed for professional applications with high energy demand, such as digital cameras, flash equipment, medical equipment, and more. The nickel-metal hydride formulation is not subject to memory effect, so their full capacities will continue to be usable after each charge cycle, regardless of whether they are fully or partially drained before recharging.These cells can be charged safely in conventional chargers and also in high current type fast chargers, and are capable of functioning in extreme environments with temperatures ranging from -4 to 122°F.