As I suspected, all mini battery are just that mini.
Sucks to hear as I have mini battery from a friend & I have it on my list of upgrade. May have to scratch it out or get another one for backup.
I was told by my service manager that a weakened stock battery or a smaller battery could cause problems with the AWD system. The ACD pump is electric, and per him, very finicky to voltage drops. Maybe you guys with the small batteries might want to keep this in mind and keep an eye on it.