AccuEvolution Low Self Discharge NiMH D Cells
The AccuEvolution ready-to-use rechargeable battery offers the advantages of both alkaline and NiMH cells without their disadvantages. Similar to NiMH rechargeable batteries AccuEvolution can be recharged up to 1000 times. But unlike NiMH batteries they keepmost of their capacity over time.AccuEvolution batteries outperform even top-notch NiMH batteries with higher initial capacity. While conventional rechargeable batteries loose 20% of their capacity every month, AccuEvolution looses only 2% of its capacity every month. After only 1 month the AccuEvolution 2200mAh AA cell offers more useable capacity than a more expensive, conventional NiMH 2700mAh AA battery.  Meaning, for instance, that your flashlights will still shine bright even after months of storage.