Chriull Posted December 19, 2016 Share Posted December 19, 2016 At one of my last recherches i found at http://batteryuniversity.com/learn/article/discharging_at_high_and_low_temperatures the following paragraph: "Matched cells with identical capacities play an important role when discharging at low temperature and under heavy load. Since the cells in a battery pack can never be perfectly matched, a negative voltage potential can occur across a weaker cell in a multi-cell pack if the discharge is allowed to continue beyond a safe cut-off point. Known as cell reversal, the weak cell gets stressed to the point of developing a permanent electrical short. The larger the cell-count, the greater is the likelihood of cell-reversal under load. Over-discharge at a low temperature and heavy load is a large contributor to battery failure of cordless power tools" i can't really follow this cell reversal thing in detail (by now), but since this site seems to be a serious source for in depth battery knowledge i tend to trust their conclusion... Link to comment Share on other sites More sharing options...
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