The most reported battery incidents happen during charging batteries. The issue can be because of either the battery or the charger having a issue. This is why people warn not to leave batteries charging unattended if you leave your home or overnight. It sounds like the outlet you used had a short circuit and should be evaluated by a certified electrician.
If the outlet had a short circuit it would have blown the breaker or triggere an overload on the fuse (if anybody still actually lives in a house with fuses instead of breakers) and within a few seconds and the circuit stops flowing.
When you reset the breaker and it trips again, without anything plugged in, the short circuit is in the outlet box or wall wiring of the structure. If the breaker does not trip again, the short circuit lies in something that draws power from the wall wiring, i.e. what you plugged in.
As Rick pointed out, this is not the first report on ECF and elsewhere about nitecores, which is quite frankly why I don't recommend them, JMHO, I think there may be clones of them out there or something.
You would be hard pressed to find posts anywhere on ecig forums or otherwise, of PILA chargers having problems.
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