It is recommended to check the electrolyte levels of wet-cell or flooded batteries at least once every three months.
Additionally, it's crucial to keep the cables clean and dry. Even a small amount of corrosion can lead to malfunction or failure to provide power in wet-cell batteries.
To learn about maintaining your battery, please click the link below.
https://www.busconversionmagazine.com/bcm-blogs/battery-maintenance/