Swapped batteries w/ the optima in my car. Symptoms followed battery. Took it back again and this time it was testing out bad...
yup, same thing that happened to me: tested good then later tested bad. 
it was bad all along. :upset:
mine tested fine as well, at an auto repair place near my office. after the slow crank got worse, i took it to the auto parts place where i bought it. when they tested it, they said it had a dead cell and replaced it on the spot. been fine ever since...
Sears Platinum In mine has worked very well used it for the power outage last snow storm.
4 year replacement 100 month prorated.
I had a battery that kept dying in my work van. Took it back twice and they replaced it no questions asked. After the second one, the guy at the parts counter said to have my alternator checked because as they go bad they put a drain on the battery also.
It checked out fine a year ago when I had that tested when the whole mess started so I just replaced it. Once replaced the van has been fine too. So I guess what I'm saying is there is 3 things that can test okay that could be bad. The battery, starter and alternator. Hard to really narrow them down but nice once you figure it out. 
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