I bought a duralast dual cycle battery from autozone sunday, I went and put my automatic 6 amp charger on it to make sure it was fully charged because I dont know how long it was on the shelf.I heard that they can lose a little charge from sitting and that's not good.The thing has been charging for three hours now and still at 6 amps.Does this mean that the battery is no good,or not that good anymore?The charger work's fine because I used it on another battery a few minutes before that one.