I have a 48 volt club car. With the charger on 1 battery reads 8.5 volts, 3 batteries reat 8.6 volts, 1 battery reads 10.7 volts, and 1 battery reads 10.3 volts. Total voltage read 55.3 volts. Does it appear that all of the batteries are weak/bad? The cart jerks when you press the gas. It only moves at a very slow speed without being jerky. any suggestions?