I just purchased a 2010 ezgo from an individual who had never used the charger. When I used the charger last night I assumed it would work like my old Club Car Charger and turn off when it finished. This charger was on the unit for abt 15 hrs and 2 green lights at the bottom were still burning. I don't know what that means. Does that mean finished or is it still charging. Anyone have one of these? ROHS Charger model 913-4810-E3B.