Notebook Hardware and Upgrade Questions

Hello !!

I purchased this laptop a month back . It's an HP Spectre X360 15-inch GTX 1050ti model . It was purchased in the US . Right now I'm in China... I have used it couple of times , not more than a week in total...It was working fine until yesterday when I noticed " plugged in not charging " error.... I restarted the device ; no luck ....I learned from HP support that updating the  BIOS should help . I did . I restarted the computer and now it seemed to be working : " plugged in , charging ” . I felt relieved only until I noticed that the battery percentage was not going beyond 86% although it says " charging" .... I waited an hour : no luck yet.... I ran an HP Diagnostic test for battery and adapter...The adapter test result was " passed" but the battery test result showed " failed" with a message : Logic State: Ok  Charge State : Blown Fuse

I'm really frustrated. It's a brand new and a very expensive laptop . 

1. How can it  be possible that a brand new laptop encounter such a serious battery/charging failure without any reason ??

2. The warranty is  "active" but  I am in China and there's no way I can send it back to US for replacement... International warranty?

3. Is there any chance that the problem is solely software-realated and will resolve  on its 

own?? Or is the fuse really blown as shown by the diagnostic?

4. Is there a chance of further damage to the computer/motherboard if I continue to use it on AC ?? I was worried so I packed my laptop .

5.  Anyone has a similar problem and solution??

Please help !!