Okay. I read that we're talking about
three separate incidents, two in addition to OP's.
OP's mentions a woman in London who was taken to hospital for "shock" and "smoke inhalation" after her
ecig battery vented. Cause: improper charger. No actual fire mentioned.
Then there's the elderly woman on oxygen burned seriously when her oxygen supply exploded. Cause: not determined, AFAIK, but headlines blamed
ecig, which was "found nearby." Later articles revealed that the woman was a smoker and that a cigarette lighter was also found nearby. (This incident was also mentioned in OP's article.)
Then there's the bar "fire," which was actually a venting battery (incident caught on video). Cause: improper charger.
Let's not confuse these incidents.