custom base for testing 4x18650 + 4xZB2L3

thingiverse

First setting of single 18650 cell + connected ZB2L3 board was done in rush as I need quickly jump to test many cells. Now I got more time to made some more appropriate and tidy solution. So here it is and you can decide to yourself of result. Initially I purchased cheap 4x18650 holder, but as you can see on one of photo, after full load of cells, it start cracking. The metal connectors are too stiff and holder plastic too weak. So I recreated better holder, in principle is the same composition, but with stronger joints and walls, so it cannot crack. I removed metal connectors from that poor holder and use them in mine version. In final version I also removed blue connector from ZB2L3 board and solder wires directly from bottom through base. More work, but looks better. I thinking of that in advance, so for each ZB2L3 board are designed more holes depend of wiring way. So you can also keep that blue connector with wires going beside board. For 5V supply are also two versions of holes directly below board and beside, in case you will use microUSB. All holes for ZB2L3 boards doesn't go completely through base, there is 0.25mm layer for easy cut depend of how you will wiring. Load resistors are behind board, because whole this charging "station" I have on wall (with hiding all wiring). Using 2x7.5R resistors to made cca 1A discharge.