2 x D 10,000mAh NimH rechargeable batteries The Powerex NiMH Rechargeable D Batteries (1.2V, 11,000mAh) - 2-Pack is a package of 2 nickel-metal hydride rechargeable D-cell batteries. Each has a voltage of 1.2V and a capacity of 11,000mAh. These long-lasting batteries are rechargeable up to 1000 times, and they have memory-free operation, meaning you can charge them anytime you like and they will not develop memory effect, a condition that causes batteries to hold less charge.