well for future reference you should charge them every time you use the cart. Can wait a day or so but never anylonger. the worste thing you can do to the batteries besides overchargeing them is to run them down constantly. Did you check connections? if not take every connection off and clean and replace and check every month or so. also check water levels then to. even more if you ride on hilly/ bumpy terrain. next step is to check the pack voltage right after charge and a half hour or so afterward.
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