Mech Button/Switch Issue - Hot Button

[nar0bin]

I have a quick question. What would be causing my button to heat up? I’m finding threads on a short in the build and then found some possibly blaming the mod, but I really doubt it's my mod. I’m pretty positive I’m the one to blame here. The mod I'm using is a brushed stainless steel 18650 tube with a polished stainless steel button. Two magnets in the switch. I'm running a Sony VTC4 battery. The build is a 28 gauge parallel dual coils in a Grand Vapor Trident V2 running at .25 ohms. I made sure all the derlin is flush in the top cap and everything is tight in the switch. Here's the kicker, it doesn't happen every time I fire it. Probably 2-3 out of 5 times I will feel that button warming up quick. I've had my KFL+ on it all day and the button never got hot. That build is a single tiger coil at around .45. Any suggestions? Of course, I'm going to rebuild but just on the scientific or explanation end, what causes the bottom button to warm up, what seems, as quick as the coil?

 

[State O' Flux]

You have resistance in the button (and, based on the "2-3 out of 5 times" reference, an apparent "sweet spot" as well)... sufficient to generate heat when using a 0.25Ω build, but not so severe that it is apparent (or rather, less apparent) with a 0.45Ω build.

Less than adequate (for the resistance) conductivity may not show up in an unloaded resistance test with a DMM... but would show up (when compared to a "known" low voltage drop mech), in a "standardized methodology" voltage drop test, like the ones conducted in a controlled, repeatable environment... exemplified by the testing, as done by jkuro on Calivapers.

Without having your mech in my hands to inspect it, I have no real suggestions other than to insure clean, corrosion free conductive surfaces.

 

[nar0bin]

Alright. I'll give it a good clean as well. By the way, it's an MCR101. I don't know if that helps.

 

[State O' Flux]

By the way, it's an MCR101. I don't know if that helps.

I've seen photos of them, and there's a long discussion of them on Calivapers, with a few references to some issues that you may be interested in, but... I've no personal experience.