I have a 2005 Club car, precedent, 48 volt. I just put in 4 new AC 12 volt batteries. After charging the cart, I can only get 17 holes of golf without running out of juice. At full charge, I get a reading of 52.8 volts ( slightly over 13 volts per battery) but it seems to run down too soon. Any ideas about what I should do? Thanks for any help.