2016 EZGO TXT Charging/Battery issue

[JBofthe74]

Over the winter my 48V TXT was completely dead from sitting in the cold garage. It would not charge and after buying a new charger still would not charge; (the charging light on the cart would not light up). I opted to try charging each better individually which worked on 4 batteries perfectly but two remained very low (using a volt meter to check them). I was able to drive it around for a day with no issues and after this all batteries were somehow at full charge. Two days later they were low and the cart would barely move. I plugged in the charger (charging light on cart still not lighting up) and after about 4 hours it ran fine meaning it is taking a charge. The following day while out driving the cart it suddenly slowed down to a crawl and about 2 minutes later started running full speed. Again, I plugged in the charger and after about an hour water was coming out of one of the batteries. I unplugged it all, cleaned up the spill and let it sit for a day. This morning I took it out and immediately smelled a burning scent but there's no visible smoke. Any suggestions here? Do I just need new batteries? *For added context I did add buggy whips last year, run through a voltage reducer, but have had no issues until after winter.