Mystery challenge! Post if you figure it out.

[FreeSpiritBalloon]

I almost did the same thing with an 18650 battery and spare mag in my cargo pocket. I felt the heat and emptied my pocket into the floor board before it went off. Kahr 9mm mag had 2 rounds come out of the mag and were loose in my pocket. Glad it didn’t get you.


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[OKNewshawk]

I'm guessing the sweating water bottle soaked the nylon of the backpack and completed the circuit causing the batter to discharge rapidly, which ignited the round.

 

[OKNewshawk]

Never carry change and a 9V in the same pocket either.

It can also happen with a 9v battery in a very low humidity situation. I was on a video job once, shooting video for a commercial for a carpet place. I had to swap out batteries in a wireless mic and absentmindedly stuck the battery in my breast pocket. It only took a minute or two before it got VERY hot! I don't remember how I took care of it--I either fished it out of my pocket quickly (the terminals were pointed down, IIRC) or stripped the shirt off quickly before removing the battery. Either way, I never did THAT again!

 

[TerryMiller]

Never carry change and a 9V in the same pocket either.

Along that thought, also don't carry a pocket knife. I did it once because I had change in my right pocket so I put it in my left pocket. Pocket knife and fingernail clippers were both in that pocket. I didn't even think of them.

 

[DRC458]

Sorry, I deserve a beating for that!

Yes. Yes, you do.

 

[Fredkrueger100]

I’m glad that didn’t hurt you. Be careful!!

 

[AKguy1985]

and dont keep 9v batteries in a drawer with steel wool. Fire bad!

 

[ronny]

Verrry interesting! You never know where the big one's coming from.

 

[Louro]

Lucky, glad tha nothing bad happened.

 

[Cowcatcher]

Well, now you know just how close you are to the making of your own minimalist survival firearm.