WARNING: Do not equalize Gel or AGM batteries. Equalizing is an overcharge performed on flooded lead-acid batteries after they have been fully charged. It helps eliminate stratification and sulfation, two conditions that can reduce the overall performance of a battery. Trojan recommends equalizing only when low or wide ranging specific gravity (+/- .015) is detected after fully charging a battery. Procedure: Verify that batteries are the flooded type. Remove all loads from the batteries. Connect battery charger. Set charger to equalizing mode. Start charging batteries. Batteries will begin gassing and bubbling vigorously. Take specific gravity readings every hour. Equalization is complete when specific gravity values no longer rise during the gassing stage. NOTE: Many chargers do not have an equalization setting, so this procedure cannot be used.