A month ago I decided that I was going to switch to some better cells in my light and bought some Eagletac 2500mAh.
I recently pulled the light apart for the first time since inserting those cells to find that the +’ve contact ring is disappearing rapidly.
I don’t think it’s getting much worse right now since I took some 2000 grit sand paper to the tops of the cells and added some conductive grease to the contact ring, but I want to do something more.
I was thinking of covering the ring in a conductive epoxy like this: Silver Conductive Epoxy
Ideally this would allow me to spread and shape it the way I want to and cure hard enough that it wont be damaged by the friction of the cells.
Does anyone have experience with stuff like this?
I’ve seen the mod where someone has taken some new PCB and soldered it to the existing, I’m not sure why the new PCB would hold up any better than the original though.
I also don’t have a magnet in the required size for the other wear-decreasing option.
Buy a sheet of copper, then using dremel or similar shape and fashion to size, then attach this with the paste in your link.
The issue I see is getting the paste perfectly flat, where as attaching a ring of new copper won’t be a problem.
I’ve used similar to this before, it was a US branded product many many years ago, it worked perfect, but was very thick to work with.
You could always coat the new copper ring with DE OXIT afterwards, this really is ace stuff, but pricey.
tabs
You could use solder, but it is pretty soft and would wear. It is easy to do and would probably be fine. You could renew it as needed.
I would probably cut a matching ring from thin brass sheet and solder it to the existing ring (OK, I would use silver plated copper… but I doubt you have it). There is a thread somewhere on BLF where a guy did that to his Sky Ray King.