Continuous fire or short, not sure which happened, but now what to do?

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Mrez

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Hey all, so after using a mech for about a month or 2 I've finally had my first incident and I'm not sure what went wrong or how to proceed. I've been using a stingray X clone with various atty's, VTC4's and LG's successfully. I'm usually in the .25 to .3 ohm range, tested out on a good OHM reader. I don't over charge my batteries and I usually get them back on the charger at around 3.5 V. Just this night, I put my plume clone on, took a few hits off it, locked it and set it down to game. Few min later I notice a sweet odor and see vape coming from my mod. I grab it and it burns my thumb and index finger. I grab a tower and grab the mod unscrew it enough so there isn't a connection and drop it in the sink. I am also able to get the atty off around this time. I let everything cool down, the battery was pretty warm but not hot (but it could have cooled off) no venting as far as I can tell, but it does have a few burn marks in the wrapper where the wrapper has been chipped a bit over time. I put it on the charger just to get a quick read on it, and its showing up as 3.5 and charging.

The mod itself looks in order, I checked everything, took apart the switch and looks good, the only thing I noticed is where the floating top pin is, thats always been real loose, as in will fall out ( I pushed a Fatdaddy vapes upgrade pin through and it was a bit wider then the existing hole, so I punched a screw driver through the hole and made it a hair to big). I think some of the delrin melted a bit because the floating pin is staying where it should now.

The atty for the most part seems to be in good shape to. It's a plume viel clone, with twisted 26's coming in a .3 or so. The atty has always been a touch problematic because the contact pin on it is very extended out so its always a pain to get it to rest even on the top cap and tighten up the switch so the threads aren't showing, and the screws while very good, are also long so if the delrin piece is rotated out for full air flow it will hit the top of the screws. The coils look fine, and the new rayon wick that I put in early are also fine, and un burnt. The only damage was to the top piece of the plume veil, the delrin insert melted and will not move, which isn't a horrible big deal because i have a spare cap anyway.

I cleaned everything up earlier in the evening with paper towel and water and dried everything up before i used it, it was all gunky from halloween makeup BS, my grubby hands, and of course the occasional juice leak, which with the plume always seemed to happen.

Anyone got any thoughts of where I went wrong? Did I short? Or just over tighten and let it fire to long before I noticed it. The mod has always had a fairly short throw which needed some fiddling with before it started working the way I wanted. Secondly, is the battery safe? are the chips in the battery wrapper the culprit because I would say 3 out of my 4 batteries have them, even one of the new LG's that I thats only a week or two old.

Just as an afterthought, I did just try a fresh battery and both the plume viel and another atty really quick, and everything fired up as expected. So what gives?
 

edyle

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The battery wrapper is exactly that: a wrapper.
It is not a proper thick rubber insulator.
It is just a label wrapper.

It just happens to be of plastic insulator material.

Once that wrapper material has a tear or gets stripped from repeated sliding in/out on the threads/edge of a mod, if it is a bottom fired mech mod, you end up shorting the mod.

This is a common problem inherent on all bottom fired mechs because the batteries are designed that way as a can with most of the battery being negative on the outside. A bottom fired mech relies on the battery being insulated on the sides.
 

Mrez

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I think a stingray should have a rubber of delrin insulator on the switch... maybe its just a plastic washer. I would look for one of those.... or a better mod that doesn't require being locked to set down without self-firing.

Interestingly after I put the upgrade magnets in it the mod has never autofired when set down unlocked. It's got a bit of a wobble, but it never fired. I took a look at the atty today, a plume viel, and completely dismantled it. I'm pretty positive at this point it was an auto fire for about 5-8 min or so. The delrin insulators on the center post were melted, but the coils and rayon wicks were fine oddly enough. I had some spares from another plume that was crap and replaced everything. The issue with this clone was the brass contact had always been very far extended from the post. I always had to really clamp down on the tightening to get it secured correctly without have threads show on the switch. I think, I over tightened it. The battery in question took a full charge, but I havent tried it yet, and won't until its sealed up with a new wrap or that liquid electrical tape mentioned below.
 

Mrez

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Id just paint some liquid electrical tape on the battery's exposed parts...cheap, easy, and quick way to insulate just about anything you want to insulate. Available at most hardware stores.

Thanks for that suggestion, sounds like a solid way to cover the little micro nicks that I have in 2 of the cells.
 
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