If/when I replace mine, I'm replacing it with an Optima RV/Marine. Yes, they cost a little more, but no water, no worries.
We have one right now on another trailer and it's been trouble and maintenance free for the entire year we've had it. Put it in and it hasn't come back out of the battery box since. It's had the battery tender on it all winter.
We got ours at Costco.
2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9467.8 (as of 5/26/19)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR