No experience. Buy or better yet see if you can borrow a car battery charger. Then try charging the batteries. The charge will be 12 volts so do not know if you will have to do each battery or if you can do all together. My guess do all together for a day or two and you will have gotten some charge back into the batteries.
My guess is the batteries are probably old and should be replaced. I don't think leaving the batteries off the charger for 6 weeks would cause this problem.
Also get a volt meter and measure the voltage in each battery. They may have a charge and the charger is the problem.
If you can borrow a cart charger and see if that works.
Probably do my suggestions in reverse order.
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