I Also have shat 2 oddyseys batterys, and did have the same concerns hiddeous has mentioned. Unless I was driving the car often enough (which most know I don't), it would go flat, and need a jumpering. Recently I got a 16amp charger onto the battery... It didn't like it. blew the top off. So much for internally valved.. I then attempted to charge the other optima I had laying around.. that one charged up, although there was a little battery bulging going on, it only lasted for 2 days without driving... Boot mount time coming with a red top optima I think.. That battery was the bomb.