Inmotion V12 Pro

Here’s my dilemma. I purchased this unicycle from somebody online and it had burned blemishes on it. They told me the property they were in caught flames and it melted the chassis a bit. They also didn’t have a charger so I end up buying it cheaper than their listed price. I finally get it home can’t get it to charge so I decided to take it apart and look at this. Now I don’t have any problem repairing and rebuilding this wheel, but I do have some concerns and want to get inside on if you guys think that the batteries may be bad as well. I have not used any voltage tester or anything yet and my parts have not arrived, but I will update this post every time.