5-stage: initialization, soft start, Bulk, Absorption, Float;
initialization:the charger power on and detect the battery correct conntect, When the battery correct connect,then the charger will give bulk current charging, "Absorption"stage is followed,the output voltage is limited at 14.7V; When the battery is nearly full, stage"float" will turn on duty, at this stage,the battery is charged completelyand the charger output some pulse to maintenance the battery