9 Volt Battery from CR2032 Coin Cells
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This is a way to make a 9v lithium ion battery from 3 CR2032 coin cell batteries.
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- Printables
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- Portable Devices
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- Creative Commons — Public Domain
This is a 9v battery. The idea is you take apart a dead 9v battery to harvest the terminal, then solder some wires on. Then run those wires through the frame to make contact with three CR2032 cells. That way you can make a lithium ion battery fairly cheaply.
Its not difficult to take apart a 9v battery for harvesting the top. Just rip the metal shell off with pliers. Its made of thin sheet metal. Internally 9v batteries are made of 6 individually sealed cells so there is no risk of a chemical leak. The terminal is just held on with pressure so it comes off easily without the sheet metal casing holding it together.
The small terminal (the male) is positive on a 9v battery. Female is negative.
This will hold less energy overall than an alkaline 9v, but will have about a 10 year shelf life. If you don't use 9v batteries very often this can help you simplify your battery setup.
Be aware that the spring is in the Z-axis (the weakest axis) so make sure you have good layer adhesion. I printed from ASA then dipped it in acetone to solidify it. PETG would probably also work though. Its designed to be printed without supports. The lid is a friction fit so if its too tight try reducing the scale by a few percent.
You can wrap the outside in electrical tape if you are worried about the wires making contact with something. Wires are designed so positive goes up through the bottom, and negative goes around the outside. This minimizes the chance of a short circuit.
There is a thinner spring version for materials too stiff for the standard version. ASA and ABS work with the thinner version a little better.
Made in Onshape. Design file available here:
https://cad.onshape.com/documents/32462fd0ee555f8963715a96/w/b5cae1fceacc1da812b3c61c/e/8a0ee910dbfc541ba2a6653d?configuration=_9v_battery_depth%3D0.017%2Bmeter%3B_9v_battery_width%3D0.025500000000000002%2Bmeter%3Bcr2032_diameter%3D0.02%2Bmeter%3Bcr2032_height%3D0.0032%2Bmeter%3Bshell_thickness%3D0.002%2Bmeter&renderMode=0&uiState=6a42b9385c941f9a557812c5
Files are public domain so use them for anything you like.