I had a red top Optima battery that lasted less than a year. When I took it back to Walmart to get a replacement under warranty, the guy there hooked it up to a tester and said it was fine. I did the full drain/reset on the battery based on what the Optima site recommended and that didn't help at all. I told the guy that regardless of what the tester said it would not hold a charge for more than a couple of days. The replacement battery I'd already put in my truck had no problems, so it wasn't a short or problem with the vehicle. He just kept repeating that the battery was fine.
I recharged it, and tried the Optima in another vehicle and had exactly the same problem. Went back to Walmart again and explained everything and they wouldn't budge at all. When I contacted Optima they said I had to deal with the store I'd purchased it from for any issues.
So long story short, the Optima battery was the worst battery I've ever had, the service from Optima was non-existant and Walmart just sucked (no real surprise there....)