Amstron AA to D Converter, 2 Pack. Use your AA batteries in equipment that takes size "D" batteries. Just slip one of these sleeves over the battery, and your AA battery turns fits a size D bay. The convertor works with AA batteries using any technology, whether Alkaline or rechargeable battery. But for rechargeable batteries, they mean you can take a completely new approach. Rather than keep rechargeable batteries in several sizes, you can standardise on AA batteries, and one of the fast chargers for AA batteries. You can still power your size D applications, but save batteries in an extra size.
