Well, a lot of today's batteries come with a 72 or 84 month warranty...
If my OEM batteries lasted less than 5 years I'd feel cheated. 6-8 years would be a lot better.
That said, it seems the battery in the rear on the passenger's side is taking a beating heat wise. Heat or vibration will kill a battery
The Constitution needs to be re-read, not re-written!
If you can't handle Dr. Seuss, how will you handle real life?
Current oil burners: MB GLK250 BlueTEC, John Deere X758
New ride: MB GLS450 - most stately
Gone but not forgotten: '87 F350 7.3, '93 C2500 6.5, '95 K2500 6.5, '06 K2500HD 6.6, '90 MB 350SDL, Kubota 7510