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Location is a big issue, battery management system is a big issue as well. Charging, isolation, and so on. I have been reading up on this till I got a headache. I just put 6 batteries in the motorhome so a little of this is familiar.

The best discussion on this seems to be the Australians who do this for their outback rigs. Not everything applies to your situation but a lot does: Outback Joe

He goes from a simple parallel wired 2nd battery to a very complex system so he covers all bases. This guy on F150forum.com agrees with your passenger frame mount option:
My situation is a bit different, because all of the units have had a topper installed on the rear. In most iterations, the battery when in the passenger side toolbox. On this truck, it's going in the bed itself, mounted to the vertical wall we install to mount equipment. This will let me have a larger battery to drive the equipment, so I can do things like keep the emergency equipment running on most scenes without idling the truck.

On a non-topper-equipped vehicle, it would be a challenge. I'd either consider something in the bed (with proper restraints and a waterproof box) or consider something attached to the frame rail. Passenger side in the vicinity of the doors would be your best bet.
Sounds like you are on the right track!
 

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Does a second battery need to be exactly the same size? Diesel E-350s had either one (7.3L) or both (6.0L) batteries mounted on the outside of the frame. I think it was an option for some gas-powered units as well; the battery boxes are available on eBay fairly regularly. Originally, these vans came with Group 65 batteries (750 CCA in AGM form). An H7 battery is only 9mm longer, and should fit in the box. I can measure it exactly if anyone is interested, as I have a spare box in my garage. Note that an H7 has 850 CCA versus 900 CCA for the H8 in our F-150s.

A general question: How would you program the new battery capacity in the BCM? In my Volkswagen, whenever I change the battery, I am supposed to program the CCA into the powertrain control module if it differs from what I took out. It looks like the F-150 has the same configuration requirement to help the alternator properly charge the new set-up. There is no way to double the overall capacity in Forscan, if I understand this correctly. I see one comment about disabling the BCM altogether....

 

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2019 3.0L KR 4x4
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49 Posts
@beaker the batts should be the same size when wired up in parallel. The CCA is high on these ford standard equipment group 49 which I guess the 3.0 needs…good points on the BCM thing. I guess it would be best to replace the main battery when adding the new so the voltage is balanced on both for their age….
 
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