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Originally Posted by villagetinker

I agree with you, in a previous series of posts another villager noticed his 2017 Yamaha was actually OVERCHARGING the battery. He came up with a solution, which he implemented. I confirmed his solution, and modified our cart as it was also overcharging the battery, then with his concurrence I posted the details on this site. The interesting point is that a golf cart repair service overheard me discussing this with a neighbor, and he stated "this was a known problem, but it did not occur on all Yamahas".
My point I think Yamaha as well as the authorized dealers have a quality control problem.

Also, one should note, continuing to overcharge a battery reduces its capacity and will eventually ruin the battery. Many carts have modifications past original use standards from the factory. This too can affect the cart in unforeseen ways. Always disconnect the battery when charging with a charger. Rectifier circuits as well as other components can be shorted or burned through on the cart if this isn’t done. Diodes etc are meant for voltage to travel only one way.