The battery is reduced to a lower level of Voltage around 13V to reduce gassing and prolong the life of the battery, this is sometimes referred to as the maintenance charge. (Bulk Charging, Absorption Charging, Float Charging, Equalization)
Float charging
First stage of charging cycle. Current is sent to the battery in a constant maximum safe rate until the battery voltage is about 80% of full charge. (Bulk Charging, Absorption Charging, Float Charging, Equalization)
Bulk Charging
Voltage remains constant and current gradually tapers off as the internal resistance of the battery increases during charging. voltage applied is about 14V - 15V (Bulk Charging, Absorption Charging, Float Charging, Equalization)
Absorption Charging
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