I have found that the truck will do an odd set of things when the battery is low. The passenger door will stop locking via the door handle, none of the dome lights will go on, and I noticed that the chime and the proximity sensors will only beep through a single speaker.
Once I put the truck on the charger, all of these issues solve themselves and everything goes back to normal.
I did notice however, if you charge the truck, and then do nothing, i believe that the BMS does not see the battery as full and allows a drain down to occur. Only after you've taken the full battery for a drive do I think the BMS resets and begins to hold a charge again.
Overall, motorcraft batteries are absolute garbage. I hated them in my 2014 Raptor, my wife's old 2017 Explorer, and my GT350 needs a new one because it won't hold a consistent charge.