Energycell HR20 D Size 5000Mah 1.2V Rechargeable Battery Pack of 2

Rechargeable batteries immediately ready for use

Retain up to 70% of energy after a year after charging Up to 300 charging and discharge cycles

One of the highest capacities among next-generation rechargeable batteries-1000mAh

They do not have "memory effect"-they can be loaded at any time