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An equalizing charge is nothing more than a deliberate overcharge to remove sulfate crystals that build up on the plates over time. Left unchecked, sulfation can reduce the overall capacity of the battery and render the battery unserviceable in extreme cases. An equalizing charge also reverses acid stratification, a condition where acid concentration is greater at the bottom of the battery than at the top. Experts recommend equalizing services once a month to once or twice a year.
Applying an equalizing charge by raising the voltage of a 12-volt battery to 16 volts for 1â2 hours also helps by mixing the electrolyte through electrolysis. Avoid extending the topping charge beyond its recommended time. Acid stratification cannot always be avoided.