Lead-acid batteries are prone to sulfation.  Any area of a battery plate that has been discharged for longer than 72 hours will start to become charge resistant.  The battery's ability to accept a charge is reduced and it will act as though it is a smaller capacity battery.

A desulfator will repeated send a short pulse of a high voltage to the battery "knock off" this sulfation and allow the area of the plate to once again accept a charge.

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Last modified: 10/20/04