I have a 1999 audi a4 2.8 with 160,000 miles. Yesterday it took three tries to start it in the morning. It cranked but didn't want to turn over. It didn't sound like the slow crank I think of it usually soundind like when a battery is bad but I'm inexperienced and could definitely be wrong. At lunch the car started fine. At the end of the day it started fine, I drove it 5 minutes and went to the bank, when I tried to start it again after that it took 3 tries again to start it. I took it to Autozone to have them check the battery/charging system. They said that both checked out, the battery was charging at 13.27 volts. However the battery is 8 years old. Is it possible that it's just a battery going bad or do these sound like the symptoms of something else? Any help would be appreciated! Thanks!