06 EZGO TXT golf cart was charged on a thurs, didnt run it. Two days later I went to plug in to check the charge because we were going to use all day on Saturday and I got a double red flashing default lite. Ran the golf cart for about 45 min total during the day and eventually ran out of power. I noticed it slowing down and just made it home. Plugged the battery charger back in and it charged for about 5 minutes and the default started to flash again. The batteries have about 6.02 to 6.15 volts. ANY IDEAS?