I work at the end of a gradual of about half a mile. More and more I notice that after a day at work when I head home, my battery shows about half full when I start up the hill. It charges back up to full after about a mile or so of regular driving. I have had no error codes of any kind. The car is a 2002 with 135K miles, so I'm sort of waiting for the shoe to drop on having to get my re-involt. Is this a symptom of the battery starting to die?
