Right. Have had the battery fully charged and confirm that initially it is around 13.2 volts, but when the battery tester is applied the voltage drops, and remains steady at around 12.3 volts. Probably not enough to turn the engine over. Maybe, as Dave suggested, the battery is in fact on it's way out? Looks like saving some cash and investing in another gel battery!
What sort of tester is being used? I don't trust electronic testers, they are pretty good most of the time but they don't apply enough load to really be sure. I used them quite a bit when I was working and found them to not be reliable. Usually showing good batteries bad but sometimes showing bad batteries good. The one in my 94 chevy tested bad 4 years ago, it's still in there.
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