Wow crazy. My 6 year old Optima is as strong as ever, and I've completely cycled it dead 3 times due to alternator issues a while back. Engine cranks very healthy even at 10,000 feet elevation and below freezing (Dusy-Ershim trail).
Sorry to hear they are loosing it. I've always recommended Optimas. We ran an Odyssey in our Formula Toy and loved it.
Yeah, my 10 year old has been cycled dead at least 3 or 4 times, and I've never even put it on a charger, just bump/jump started it and let my truck charge it up. Love my old Optima, I will be very sad when it finally kicks the bucket.