The Powerex MHRDI2 IMEDION "Ready When You Are!" Rechargeable D NiMH Batteries (1.2V, 9500mAh)- 2-Pack is a package of 2 D nickel-metal hydride (NiMH) batteries. They have a voltage of 1.2V and a capacity of 9500mAh. The batteries can be stored for extended periods of time without substantial loss of capacity. For instance, after a year, they will still retain up to 85% of their full charge. The batteries come pre-charged and can be recharged up to 1000 times.