Re: I'm putting a bet....
If the batteries were quality, they would have had protection circuits built in. If the wiring was cheap it would have just melted like fuse-wire (a protection in itself). From the photo I'd say that battery went up properly.
I can't help noticing she was flying from China... If she bought herself a present of some new headphones over there, who knows what she was wearing (she certainly wouldn't!).