Batteries under the seat don’t make sense to me. I’m deleting the factory battery and installing a new larger AGM up front.
Built a custom bracket specifically to fit the new battery. Just got done installing a power steering kit and the bracket clears it since the battery height is low. I searched high and low for a couple days before finally discovering this particular AGM battery thru Auto Zone. Over twice the size of the factory 700 battery, good reserve capacity, 330 CCA at 0 degrees (not 32 deg CCA rating like others), and the dimensions are just right to mount it up from where I wanted. Also the weight of this battery is only about 28 lbs so it’s not a ridiculous amount of extra weight in the front. This battery leaves enough room for the fuse/relay block I’ll be installing as well as some room on the side to maybe mount a tray for storage. No need to move the radiator at all.
Still waiting on my battery wiring kit to arrive, but the plan is to run 4 awg back to the original battery location under the seat, remove the OEM battery and place terminals there. This way I have a spot to wire equipment under the seat as well as the battery in the front for other things like winches (which I also have on the way).