[forest pines golfer]

Hi, new to forum. Any help is greatly appreciated. Recently purchased 2008 precedent with 4-12 volt US batteries. Powerdrive 3 charger when plugged in to the cart will peg out past the 15 amp mark on the charger. Batteries had sat for a while before purchase but they all take a charge and the cart will run. Charger won't back off during the charging. I don't think this is normal but not really sure. I have added water to batteries but as of yet haven't got batteries too hot while charging. Afraid to leave charger running for a long period of time. Also I have a volt meter and the highest reading I have taken after a charge is 49.3. I just learned from reading another post that 50.9 is a full charge. Anyone have any suggestions. Thanks