OK, I had a strange problem with my optima battery a couple of days ago. When I tried to start it, I got the usual solenoid clicking associated with a dead battery. It wouldn't take a jump. It was late and dark, and I ended up getting a cheap battery from Pepboys. With the new battery in place, it started right up. Last night I put a volt meter on the optima. It read 12.5 volts. That wasn't what I was expecting! I was thinking it wasn't holding a charge any more. Anyway, I hooked it up to my J**p (which happened to be in the garage at the time) and it easily started right up. So, now I'm thinking there must have been a loose connection in the blazer. So I put the optima back in the K5, check all the connections. cables, etc. and I still got the same solenoid clicking. Then I put the new, cheap battery back in and it started right up. There are a couple of things to note. First, the optima is 3 years old. I know the J**p is only a 6 cylinder and the K5 is an 8. The starter in the K5 is a couple of months old. The last point is that the new, cheap battery spins the K5 starter a lot faster then the optima did. So, what do you think is going on here? I guess I should have to optima tested and see what they say but i was suprised that it would start the J**p so easily and it wouldn't start the K5 at all. I also expected to optima to last longer. Any thoughts? I have 2 other optimas in other vehicles and I might do some more swapping around tonight.