[Kounotori_DIY] uses a small plastic linear guide as an interface for an 18650 battery holder and as you can see, it’s pretty slick. A little cylindrical container slides out of the assembly ...

Draining a battery is easy. Just put a load across ... four ceramic power resistors, a holder for a single 18650 cell, and a rocker switch to connect it all together. But wait, what’s that ...