Last week I had too much going on. Oil change was due. So to get a head start I checked mileage when I arrived home. Could not find my key the next day. Left it in the ignition. Battery was deader than a hammer. So last Thursday put it on my charger. Was not charged till next day. Had funeral out of town and drove 200 miles no issue. I was certain I damaged the battery. Lead acid is not forgiving. To my surprise our car has an AGM battery. Only battery listed at Wal-Mart, Auto Zone, Advance, and OReillys is AGM. Lowest price $149 at Wal-Mart. The parts stores in the $200 range. Wal-Mart was out so made an appointment with the dealership. I was told it was $179 for the AGM A/C Delco installed. Same battery was $169 at Amazon. First thing dealership did was test my battery. To my surprise it is at 89%. So my 3 year old battery with one full discharge is doing great. Dealership gives you a printout which is nice. I had a free battery test coupon but did not need it. They were very nice said I was good to go. The moral is the story is OEM AGM battery is is like a Timex watch. Takes a liking and keeps on ticking. Also I found you need a charger rated for AGM. Read my charger manual and it was AGM rated. Sweet!