This just an observation, so I will put it in the General Chat forum. I have a 2001 SSEi Bonneville with 180,000 miles that I have owned since it was new in May of 2001. In all of that time, I never had to replace the battery. Normally, I expect to get 4 to 5 years out of a battery. It must have something to do with the battery being located inside the passenger compartment under the rear seat, which protects it from the extremes of temperature and vibration most batteries experience in the engine bay.
I have at one time or another fixed all the problems that seem to plague our cars (window regulators, water leaks, front motor mount, rear shock mounts, steering wheel intermediate shaft, wheel speed sensors, fuel level sender, etc.) so its nice to think there is something on our cars that actually performs better than expected in terms of maintenance issues.
What is everyone else experiencing with their batteries?
2001 Bonneville SSEi (retired at 365,000 Kms.)
2014 Jeep Grand Cherokee Overland (yes, I know its not a GM)