TWO INCIDENTS ACCURED WITH 24HRS. MY WIFE CALLED ME INFORMING THAT THE 2018 X5 WAS SMOKING FROM THE FRONT AND MAKING A WEIRD NOISE, SHE STOPPED THE VEHICLE AND THE VEHICLE STARTED AGAIN. WHEN SHE GOT HOME, I CHECKED THE UNDER THE HOOD, BUT COULD NOT SEE ANYTHING. BUT, CAN SMELL LIKE BURNED WIRING, BUT NOT VISIBLE. I CONNECTED EV WIRE TO THE VEHICLE AND NEXT MORNING DISCONNECTED THE CABLE AND WHEN I STARTED THE VEHICLE, I SAW SMOKE COMING OUT OF THE INSIDE BOTTOM OF THE REAR WHERE THE BATTERIES ARE LOCATED. I OPENED THE REAR DOOR AND RAISED THE COVER TO SEE SMOKE COMING FROM MELTED WIRING. I IMMEDIATELLY DISCONNECTED ONE OF THE BATTERY WIRES.