Some quick googling comes up with this:
Reversed polarity cell in Lead Acid Batteries Forum
Quote:
Normally cell reversal occurs when a weak cell goes to zero volts and the continuing load induced current through the cell places a reversed charge on the cell.
This is ONE of the reasons you are NOT supposed to take a 12V batt below 10.5V.
Recovery procedures are to run the entire battery down with a VERY LOW load (100 ohm to 1K resistor) untill the battery zeros out. Then recharge at VERY LOW charge rates (0.1 amps) while pulsing (0.050 amps pulser, 0.050 amps charge).
I have had some successes using this technique.
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