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Subjecting a discharged cell to a current in the direction which tends to discharge it further to the point the positive and negative terminals switch polarity causes a condition called '. Generally, pushing current through a discharged cell in this way causes undesirable and irreversible chemical reactions to occur, resulting in permanent damage to the cell.Cell reversal can occur under a number of circumstances, the two most common being:
* When a battery or cell is connected to a charging circuit the wrong way around.
* When a

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