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FDK Twicell 2500mAh NIMH Button End AA Low Self Discharge Single Cell
FDK (formerly Sanyo) Ultra high capacity AA Button End single cell.
Unlike Sanyo's other NiMH cells, these ultra high capacity AA cells should never be fast charged EVER. We recommend 70mah (or less) wall chargers (very slow overnight charging) only. Suggested maintenance charge rate 50-70mah. Manufacturer's listed internal resistance is 25mΩ.
 "FDK Twicell 2500mAh NIMH Button End AA Low Self Discharge Single Cell")