There have been a couple different threads on here regarding batteries. I decided to go a different route, and install a Northstar (Batteries Plus X2 Branded) Group 31 in the stock 5th gen location. My install differs from other ones because I extended the cables (using commercially available parts). This was due to the terminals on the Northstar being closer to the front of the truck compared to the Odyssey/Diehard. Plus if you need replacement in the field, you may be SOL.
You can see my write up here.
You can see my write up here.
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