it looks like its just burned a bit. maybe just a few conductor tracks or a few resistors which one could messure. if the mods arnt designed to be charged via usb port, why would the manufacturer add an usb port in the first place and risk lawsuits?
Removeable batteries for regulated mods are best charged in a separate Li-ion battery charger. Its safer and faster, plus you can monitor the battery's temperature for excessive heat by touching it while its charging. The USB is
primarily for firmware upgrades for the circuit board from your computer. It has an internal charger for
emergency situations when you don't have access to an external charger.
In case you weren't aware, Chinese manufacturers are
immune to international lawsuits.
now im using a stick x8 mech mod where you cant remove the battery. does your statement mean that the stick x8 is a ticking time bomb? if yes, why are they allowed to be sold anyway?
Video evidence of a
SMOK Stick X8 battery explosion caught on home security cam while USB charging on the kitchen counter.
Many vapers avoid the internal battery mods altogether because they feel USB charging is more dangerous than charging external batteries in a Li-ion charger. I personally don't go
that far, but if given a CHOICE I'll always choose to charge externally over internally. One study found that 80% of all battery explosions reported occur while charging.
E-Cigarette Explosions: Comprehensive List
"The FEMA document cited above suggests that approximately 80 percent of e-cigarette explosions happen during charging."