Join Date: Aug 2006
Location: Arlington, VA
Thanked 13 Times in 11 Posts
Rep Power: 11
Your experience differed because of the frequent use of your boat ("about twice a week from May to October"), and because you kept the battery on a smart charger over winter. Letting a flooded battery rest for a few days is OK. Letting it sit for weeks or months is not OK.
A solar panel, properly sized, can help a lot for a boat which is infrequently used.