As pops stated, the Optima redtop in my t bucket was constantly found dead after sitting 30 days or so. I do have a small battery tender on it and never ever have a problem now. I just installed an Optima Redtop in my ZO6 Vette 2 weeks ago. That car sits under a cover alot and so far so good. I think the key is either driving them as much as possible OR keeping a tender on them at all times.

My boat has 3 batteries (2 group 24 starting and 1 group 27 deep cycle) I keep a tender on them at all times and they are good to go EVERY time I hit the key now (including the deep cycle house battery) These are all flooded, old style batteries.

I say drive them or put a tender on them.
Don Jr.