I need a 6v battery for an LED flashlight and didn't feel like endlessly buying huge batteries. I saw something like this on thingiverse that used a 4x AA battery holder soldered to springs from an old battery. I didn't have one of those battery holders. I also saw this one here: https://www.printables.com/model/620857-4r25-6v-blockbatterie-aa-adapter-4r25-6v-block-bat which was a neat idea in using the batteries as the contacts, but it also required some special springs which I didn't have. I decided to design a hybrid of these, all you need are the springs from an old 6v battery and a small piece of wire. I soldered the wire to the springs as shown and then they fit through the side of this model and drop down to the bottoms of the holes. For the center spring which contacts the positive side of the AA battery, I crushed the spring a little with pliers so the center of the battery would touch as shown in the picture, spring on the left. Then just drop 2 AA batteries in the center hole with the negative sides facing up and 2 AA batteries in the outer hole with the positives facing up and voila! Worked well on my flashlight, but there may be differences in how the batteries contact in other devices so YMMV. The AA batteries sit a little (2mm) higher than the spec battery measurements but the springs have a lot of give in them and seemed to be fine.
To get the springs out of the old battery I went around the cap with a screwdriver and hammer until the cap popped off, then I drilled the rivet out so the entire spring popped off. I suspect you could just cut them off without opening the battery too and it would be fine.
I added a big upside down pyramid inside so it should print easily with no support. Enjoy!
The author marked this model as their own original creation.