I posted this a bit earlier today and didn't get much of a response. I figured I'd post in the diesel section to get a bit more exposure on the issue. Just a quick battery question for everyone. In January 2016 my OEM battery took a dump. I was in a pinch (couldn't do much research) and picked up a Bosch Platinum Series AGM H7/94R (spec wise a much better battery than OEM) from Pep Boys. The battery got me through the rest of the winter and was a champ all summer long. Just recently (start of November) I've noticed that in the mornings when I start my car (it sits outside overnight for about 14 hours), it cranks a lot harder and takes longer to turn over. This got me nervous, as its only been in the low 30Fs and IL winters get far colder than that. I took it to the dealer to have them do some testing on the battery, alternator, etc. Everything came back aces and I was told that the most likely cause was short tripping. I drive to and from work 5 days a week, 20 miles round trip (70% stop and go city, 30% "city hwy" - 40-50mph) and usually get a good hwy drive in once a week. In my mind, that's not really short tripping. What do you guys think? Am I really short tripping? Time for a new battery already? How long does it take to top off the battery charge from the alternator when driving? Any other causes? This was never an issue with the OEM battery. That was great until the morning it just died with no warning.