This is a battery pack for my DSO138 Combo tool case.
the battery uses actual pring tabs to keep in contact with the batteries at all times:
the batteries are from here :
print two of the bottom case, and two of the seperators,
assemble and solder the battery terminals like in the picture
your voltage take off is on the bottom plate on both sides and on the upper side on the turn around voltage at the turn around is 6V, positive voltage on the end is 12V, with the batteries i have it is a 12V 3.3AH battery which for my DSO is a big battery.
after you put the springs on the bottom plates, use s abunch of 3-2 aluminum rivets to attach the plate to the separator... if you dont have rivets , well im not sure what youd do but 3mm bolts work as in most of my designs. its just a ginat waste of reusable hardware because this part you will never have to take apart again...
putting the batteries in is kings a pain becasue of the spring tension, if i were to make a suggestion, use a vice.
2 long bolts or all thread pieces hold the hole thing together once you have the batteries in it you can tighten the bolts and solder on your battery leads.
after it is finished printing and i am sure the design is good i will post the DSO housing ...