That's usually the case with the negative battery cable/ clamp (which is also the location of the BMS sensor- not the positive.)Also, there have been some reports that the positive cable can corrode and that includes the electronic devices that "measures" the electricity.
Jim12Esc the negative is the terminal that is hidden from view- up against the firewall. Hopefully whoever changed the battery would have mentioned if there was corrosion, but it would be worthwhile double checking.
The parasitic drain you found with fuse 79 would be worthwhile looking into further. Hooking up a multimeter in place of the fuse and checking the current after the vehicle had been sitting for > 15 minutes would be worth doing. (Some circuits remain powered for around 12 minutes after the last door is closed, so you'd want to leave it sitting for at least 15 minutes before checking the current drain.)