Originally Posted by Alaskan Sea-Duction
The genny will charge it when it is running. I tend to run my genny much more than a few times a year.
Depends on the genny, but if you haven't already done so, check that your Generator battery charging circuit is enabled. On my 7.5 Onan, you disable the generators charging circuit, by pulling off a jumper, if you are going to connect it's starting battery to one of the boats battery charger circuits.
Also looks like you boiled all the cells out but one? Any water in the cell with the cap in place??? That could be the root cause of your problem.