Indented Negative on Battery
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Something like that is my largest concern. I feel it best to retire the mod. I have dropped the mod with the HG2 in it, but never with the HD2C. Since I started using it with the HD2C, I only use this mod at my computer desk or on my bed, it doesnt go in pocket or get taken anywhere any more. I certainly dont slam it down on my keyboard tray lol, and my bed, is, well, a soft bed. Even if I did drop it on my bed, it would be when I was laying down and fell asleep, so its only going to be a drop of a few inches from my face to the pillow or mattress.
EDIT: The HD2C is the first pink one I posted, with the severe dent.
Very interesting theory. It had been mentioned that the batteries were warm/hot coming out of the mod. I suppose it is possible but I would imagine that if the battery got hot enough to soften the metal then thermal runaway would be almost certain. It only takes about 250 degrees celcius to cause thermal runaway, and just over 100 degrees celcius to cause venting. That said, I like this theory and I wouldnt discount it in any way.
The HD2C was hot enough to make me pull it out for inspection before first noticing the dent, but I was holding it comfortably in my fingertips while inspecting.
I'm looking at it is the way that it could be a case of a secondary short, similar to a "welding" hot spot, so the short only happens at the bottom.. weird as hell, no idea how, but, this would localize the heat and only the metal bottom would heat up... afterwards, the residual heat would climb making the battery warm but most of the heat would be dissipated by then and not cause a thermal runaway.
I seriously doubt that the metal got hot enough in the MOD to deform the metal. Even a tank that was chain vaped and feels extremely hot is just barely over 100°F and feels very hot in your hand.
especially as mentioned, the top isn't being crushed, which, should be the first thing that would should it be a pressure thing.
2 batteries and a 50 dollar mod down the drain. Sucks. Thanks for the help everyone. Without your interest, I wouldn't have thought to get rid of the dangerous mod. Realistically, you may have all saved my face. I wish I knew what really was happening though. I think Im just going to stay away from mods with battery sleds like this in the future, and just go for ones with doors. Ill have to be even more careful with my RX2/3 now, since it's unknown if the physical connection or a problem with circuitry in the IPV D3 caused this, and the RX has a similar spring-loaded sled x3.
yeah, but I'm thinking a sharp spike short, the metal would soften just a split second, enough to weaken and end up with that dent from the pin pushing it....but not be actually "super hot" to feel it... then the heat would dissipate.
If it was caused by heat it would be a more uniform concave shape and not what looks like a round punch pounded into a piece of metal.
yeah.. I'm just throwing something out there...
For me it's the positive not getting crushed that's the puzzle...
The positive connections on most of my MOD's is a flat surface almost the exact size as the battery. The negative is a rounded pin on some of them and other has a flat negative that is much larger than a positive. If it was heating enough to damage the metal there would be other damage to plastic because that much heat will not dissipate fast enough. Plus if it was that much heat to deform metal I would expect to see melted plast wraps on the battery. I am pretty convinced it is an impact that cause it due to the impression left in the battery.
Surface area of the pin versus a flat for the positive end.
I'd almost say that for the sake of figuring it out... sacrifice another battery (shouldn't be any danger until it gets warped)... put it in, and check it or a regular basis, until it happens again (any signs at all), and note anything "weird" or uncommon that might happen during use.
Why throw good money after bad? Especially if the mod does have an internal short. If the mod isnt necessary and he can get by without it then there is no need to experiment with it in any dangerous way.
Hmm, maybe Ill order another battery for the sake of science. All of my other 18650s are currently married, and I hadnt planned on divorcing any of them, which in this case would render the whole set useless.
But the positive isn't a solid pin, it's a metal cap with emptiness under it, as it holds via the mounting points.
Battery Safety 101: Anatomy - PTC vs PCB vs CID
I'm just curious like that....
And the "experimenting" stops the moment ANY sign of warping starts, so the battery should be fine.
But, Steve, even if the damage is the result of the type of force you are describing, I really havent dropped this mod or set it down an forceful manner with the damaged battery. Dont you think I should stop using this mod, if the batteries are getting damaged, thereby posing a danger to me, just from inserting them?
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