Single to quad 18650 holders with keystone terminals

thingiverse

Not found a suitable 18650 sled. These sleds are all 20mm wide x 80.55mm long. Designed for unprotected cells, it's close to fitting protected ones, you could probably print 2-3% larger and it would fit without affecting other dimensions. A 1mm longer design would likely work, so a 2% increase is possible. The spring on a flat top sled compresses about 3mm deep, an unprotected nipple top should just fit. I have no cells to test with, but another 1mm of compression could be used if needed. Terminals are keystone electronics "Contact Battery Neg Spring A" and "Contact Battery Positive End A," Digi-Key part numbers 36-628-ND and 36-595-ND. https://www.digikey.com.au/products/en/battery-products/battery-holders-clips-contacts/86?k=628k-nd https://www.digikey.com.au/products/en/battery-products/battery-holders-clips-contacts/86?k=595k-nd The basic sled design has nearly 2mm of terminal poke through the base, which can be bent over to retain it. The insulator part is optional and fits over bent terminals; melt, tape or glue the parts together. The pcb version slips over top of terminals soldered to a board, with the center terminal spacing to the middle of metal on the pcb being 68.54mm according to design. Not tried printing the wired versions yet, but they're intended for heavy gauge cables to be soldered to pins in various ways and then held in place with hot melt. The keystone_term_plus/minus are not intended for printing but can be used if you want to model something yourself. Batteries come out easily enough. Let me know if you'd like any easy mods.