Maybe a dumb question
Yes….
If you have a quality Converter / Charger or Inverter / Charger, they will be properly maintained from a voltage perspective.
However, if they are wet batteries and not AGM, you need to check the acid level occasionally and add distilled - deionized water as necessary. If the cells dry out, they will be permanently damaged.
Now if your batteries are not holding a charge, it could be time to replace them. Especially if they are the original factory batteries, which are cheap and usually not maintained properly by the dealers.
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