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must stop when any cell first runs out of charge even though other cells may still hold significant charge. Likewise, charging must stop when any cell reaches its maximum safe charging voltage. Failure to do either may cause permanent damage to the cells, or in extreme cases, may drive cells into reverse polarity, cause internal gassing, thermal runaway, or other catastrophic failures. If the cells are not balanced, such that the high and low cutoff are at least aligned with the state of the lowest capacity

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