said by guppy_fish:I drove 6 minutes to and from the train station for a decade, and my battery lasted just fine. said by elwoodblues:
driving, mostly city, 15-20ms each way, 5 days a week.
This is your problem, with a standard alternator, your looking at best case about 200 watt hrs or about 20% put back in. This will lead to cronic undercharging and sulfation of the battery plates. If you can use a trickle charger to keep the battery fully charged