I know this thread has surfaced again, however, I thought I'd share a story. I went with an Optima Yellow deep cycle a few months ago and I'm glad I did! Recently, I was at a wedding standing in the cake line, and I overheard two guests speaking: "Wow, did you see that Delorean outside? Yeah, cool, wonder why the lights won't turn off!?" I put my plate down and went out to the parking lot to find I left the headlights on. This had been at least four hours since I arrived, so I didn't know what to expect. I turned the key, and it started normally! I turned it (and the lights) off and went back to the reception, a few hours later it again started without a problem. I'm sold. Here are some of the specs: 750CCA, 65Ah, Reserve capacity, 124 min @25amps to 10.5V, Group 34 Mauri T. Austin, TX #3153