all 12v/usb outlets are not necessarily run by the Vehicle's battery, but may be powered by the HOUSE battery(s)... even if they are right next to each other.
also, some devices don't operate/function properly with some usb outlets, depending on whether they are usb, usb2, usb3 types, etc. I have several iphone 'brick' usb plugs that won't work since they are not compatible with my 'newer' phone, and sometimes it's just because the usb outlet is not 'up to date' with that version of power.
'14 Thor Palazzo 33.3 compact diesel
KingTailgater2 Dish, 100w/5amps roof SOLAR, BlueOx, 100,000+mi since '14... US, Alaska, and Canada... from GA, then NC, now N AL : )