Now I need a system to separate the discharged from the charged as well as to prevent any inadvertent discharge from shorts. I also want a spacer so I can use 18650 batteries in a 26650 light. I mean, I put them in the light and they seem to work just fine and no amount of shaking has caused even a flicker. Still: I don't like it! I'm going to check out PVC at the hardware store when they open. That will make it easier to travel with them, and I do want to take them to the Philippines.
Not sure if you ever figured this one out but a section of 3/4" sch 40 PVC works as a perfect spacer to use a 18650 battery in a 26650 light.. I know this is back from last Oct and you probably already figured this out, but figured I would answer, just in case..