Less than 30k miles. OEM battery already replaced by dealer. If I don't keep a float charger on it every week or so, it will just unexpectedly go dead. I know I don't drive as much as many, but recently it went dead after the following: a six hour interstate drive, followed within a week, by a one hour interstate drive, and a one hour freeway drive. Mostly short trips to the grocery store in between. Then it went dead when I went to pick up a curbside restaurant pickup. I have been turning off the auto headlight and AV system when shutting off the ignition. Any ideas? Normal for a low mileage driver? My wife thinks there's a defect, because her 2014 Dodge Caravan always starts.