I bought some high quality Panasonic NRC 18650 and some LG HE2 18650 both Flat top.
Problem is for my new Flashlight the flat tops don`t make a solid contact the flashlight works but does malfunction when changing levels of brightness and just walking it will go threw different settings randomly so button Tops are absolutely needed.
I made a spacer from a tiny cube rare earth magnet and some high density foam and it works fine, only concerned if this would damage the batteries in anyway causing them to leak or become garbage...
I cut out a tiny piece of camping mat foam poke a hole in the middle and put the cube magnet in to keep it from shorting out, I`m going to find some hard plastic to use for the insulator instead of the foam for safety reason not sure how long the foam will take the heat before melting down bit by bit.
I tested the spacer and 2 Panasonic's with the flashlight on high for 1.5 hours the housing, head and batteries were past warm and getting hot so I stopped and checked the foam and it was still good...
Here is the 18650 flashlight 2 cell or 3 as the body has a section you unscrew to shorten it, 5 modes https://www.amazon.ca/gp/product/B071ZLHTX8/
If you can help out please reply.