No way you should be using that amount of water during normal operation. My guess would be that the charger is not working properly. They are supposed to reduce the charging current once the batteries reach the fully charged state. It sounds like yours is not doing this. Excess charging means excess boiling off of the electrolyte. Instead of leaving the cart plugged in overnight, try charging it for 2 or 3 hours at a time and see what happens.
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