You guys tried to unplug the BMS sensor and see how the truck charges? It may revert to charging like you would expect a vechile to.
Unplug for what reason? Just do a BMS reset to the system. I wouldn't be unplugging any sensor that is related to the issue I'm having...?
I had the same issue and after chasing it for a bit I installed a NOCO battery maintainer and just plug it in during the time I'm using my commuter car for work.
I have 2,067 miles on my Mach 1 in over two years and it needs zero battery maintaining. I use one, but when all this started I left it off for the entire winter and only got the deep sleep mode after 14 days, which is be design. Never had any issues with the battery itself. My truck would drive 2-3 hours and be dead when it arrived. I did ten hours and it lasted overnight before getting stupid. It's that Motorcraft battery from factory.
I agree, what ford told me in the end is because of the amount of electronics in the vehicle the alternator isnt enough to recharge the SOC on short drives. The truck needs 2 plus hours driven everyday to recharge. I called BS but at that point I got annoyed enough to not deal with them anymore.
Yeah, definitely not how it should be. No issues since the H8.