In his YouTube comment, he gives us a bit of insight:
"i was in the other room ,no fire proof bag ,and chaging it regular way .had at low rate of charge as i always do. never shown any problems before over the last year of dealing with lipo"
I'd like to know what "the regular way" is and why he'd be charging it at a low rate. If he's charging them at less than 1C is it possible he's not using a lipo charger and taking his chances with an inappropriate charger by using a low rate to be "safe"?
I am really curious to find out more.