09-29-2009, 11:05 PM
I would expect that a battery with no load on it to be at 14V then drop to 12V (approx) with a load... Measuring the current while loaded/starting would tell more, but I would expect that they already tested this at the parts store. 12.8 seems low with no load. Can you leave it disconnected over night to make sure that in it still has 12.8 with no load on it tomorrow? It stills screams bad battery to me, but this would confirm it with me.