I know this isn't the same exact car, but not that far off either. Dont they both use a Group 49 battery? I typically use batteries from Autozone for all my vehicles. They are made by Johnson Controls, which manufactures batteries for many companies and also OEM's as well. The last battery in my 123 lasted exactly 5 years to the month, and it was the mid-range one they sell. This time I bought their top of the line one & will see how that one compares. As of about 2½ yrs ago, I've kept all of my vehicles plugged in via quick disconnect terminals, to a battery pulse-charger/maintainer/desulfater. I find it really makes a difference in the battery's overall longevity. Frequently a vehicle will sit for 6 -8 weeks at a time without being started, so it's kind of a necessity for my circumstances. The two OEM batteries in my Dodge Cummins diesel pickup lasted exactly 7 yrs 4 months, and of those, only the last 2½ years were connected to a battery maintainer. Those batteries were Johnson Controls too.

When I brought the new Group 49 battery home last month from autozone, it was supposedly fully charged. When I connected it to my maintainer, it was only showing 25% charge!!! I let it sit on the maintainer for 2 days until its charge was complete, before installing it. I was amazed how well the car starts with a new battery! Really made a noticeable difference, even though it still started with the old one, just took longer.

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2007 Dodge Ram 3500 Cummins Turbo Diesel 4x4
1994 GMC S-15 pickup 4.3 5MT
1985 300 SD
1978 300 CD
1962 220-S Fintail - awaiting restoration