I'm actually replacing or deep cycle with this. I guess the extra reserve capacity would be good but I don't like the distance I'd have to run everything. It's much easier under the hood because everything is there. That's one thing personally I didn't like about the 700. I really prefer all of that under the hood with short wire runs. That's just preference though. Now with that said I've got a speaker box in that spot and definitely prefer that. I've always wanted to play with a cap so this gives an excuse. Be nice not to ever have to replace this no matter what
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If wanting to keep the accessory wiring the same is the only reason, you could use remote terminals. Just install large battery under the seat and run a pair of cables salvaged from a set of #2 jumper cables. The wires would be a joined pair and then slip them in a wire loom. Install the remote terminals in the oem battery location so no working has to change.
I know you CP already know this but not every reader may have thought about it.
Also, the safe thing to do is to install a breaker or fuse on the battery!
I still haven't made up my mind on what I want to do. Right now I'm leaning toward the single battery under the seat.