A battery is made up of a number of cells (1.2volts each).Usually one or mo re cells fail, so I buy a number of "non-working batteries", put them on th e charger, then strip them apart and check the voltage of each cell. Mark a ll the ones which are significantly less than 1.2volts, (then scrap them),t hen make as many good batteries as you can from the good cells. HTH oldchadders
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10 years ago