What is the general rule of thumb? I once read about when to add water to batteries - something about either before or after the charging process. I can't remember what the rule was. Anyone recall when the "right" time is to water the batteries as it relates to the charging cycle. For example, is it better to water after the batteries have experienced a draw such as being on the hook all weekend, or is it better to water them before we leave the dock when they are fully charged? Or, does it really not matter in our boats?