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Sulfation takes place because small
sulfate crystals form when a lead acid
battery is in use. This is normal and
not harmful; however, when the
battery is only partially charged for a
prolonged period, these sulfate
crystals turn into stable crystalline
and buildup on the battery’s negative
plates.
When this takes place, it prevents the battery from taking on a full charge.
Additionally, an equalizing charge is needed for a second reason. Over time, cells
in a lead-acid battery will become more and more unbalanced, with some cells
overcharged and some undercharged. But an equalizing charge will correct these
sulfation and unbalanced cell issues.
Things that cause Sulfation in Lead-Acid Batteries:
When batteries are undercharged, they develop sulfation as a result.
Normal recharging of a deep cycle battery with a constant charge can also
cause sulfation.
So some degree of sulfation is inevitable in lead-acid batteries.
Why Does An Equalizing Charge Help?
When you perform an equalizing charge you will break up the crystalline on the
battery’s plates and allow the sulfate to re-mix with the sulfuric acid.
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