make a battery tube to put 21700 batteries for x75 flashlight
is it pretty straightforward?
besides the electrical configuration
such as 4S1P for 4 cells or 4S2P for 8, right? that’s what someone told me might be…
is there other circuitry needed if no usb charger is added?
just get the cells arranged and wired properly
CNC a metal tube with threading
attach some gaskets or o-rings
anodize, etc
make sure to check how much the battery specs need to be? like a P42A or P45B battery.
is it possible to sell making something like this?