I’ve got a 2002 Chevy Avalanche, which for the past few years has been going through batteries about every nine months. The battery will start having issues starting the truck, will die overnight, etc. It always jumpstarts OK, it just won’t hold a charge. I’ve had the truck checked out several times by different mechanics, and no one can find a reason for the batteries dying. I did some research, and I think I may have a reason for the batteries going bad. While this was my primary vehicle for quite a while, for the last three or four years has been relegated to second car status, and only gets driven once, maybe twice a week. From my research, if the battery doesn’t get charged enough during drives, it can cause the battery to go bad over time, and since I’m only driving it about 30 miles a week, that sounds like it’s plausible to me.
So my question is how often I need to drive the truck in order to keep the battery properly charged and healthy - if I make several short trips in to town, is that worse than one longer trip? Any ideas would be great.