Parameterized battery pack with contacts

by obijuan, published

Parameterized battery pack with contacts by obijuan Dec 10, 2010

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This design is derived from the parameterized Battery compartment: thingiverse.com/thing:5051 (By Guru). I have added a simple method for the electrical connections. The proof of concept was tested on this thing: thingiverse.com/thing:5070

NOW you can print your own fully-functional battery pack :-)

For every battery there are two embedded nuts in contact with the positive and negative poles. Two metal M3 bolts are inserted from the outside. They will contact with the poles. Now, you have a wonderful electrical access to the battery!!

I have tested with 2-AAA and 4-AAA battery packs. It worked like a charm :-)

In addition, I have added more parameters for generating the battery pack: the thickness of the bottom, front and rear, and side walls as well as the distance between two batteries.

Update: Jan/30/2011. Added the contribution of eaglepex ( http://www.thingiverse.com/eagleapex ). Now the batteries can also be in serial connection changing the ser parameter


  • Generate the battery pack with the desired parameters
  • Print!
  • Embed the nuts (1)
  • Insert the batteries (2)
  • Insert the bolts
  • Set the electrical connections (3)

(1) There is a simple and powerful trick to embed the nuts into their slots (as shown in the pictures). Insert a M3 12mm bolt with a washer form the outside. Add the nut in the inside part. Screw the bolt until the nut reach the socket. Now, put the nut in the correct orientation so that it can enter the socket. Screw the bolts until the nut fits perfectly. Then remove the bolt. The nut will remain in its socket.

(2) WARNING: The batteries can be inserted with different orientations. Make sure they are inserted with alternating poles: +, -, +, - so that they can be connected in serial.

(3) Once the bolts are put, it is time to set the electrical connections. Connect the batteries in serial (Be careful of the short cuts!). It can be used standard wires. Or alternatively you can use Clips, as shown in the pictures.

Instruction for building a 2-battery-pack
See the following images: http://fotos.iearobotics.com/index.php?album=objetos-3d&image=dsc01654.jpg

Instruction for building a 4-battery-pack
See the following images: http://fotos.iearobotics.com/index.php?album=objetos-3d&image=dsc01675.jpg

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simple & good, smart idea ..thank you

Suggestion for improvement: All AA and AAA batteries have a narrower positive contact than the negative contact. A pair of ridges on either side of the nuts on the positive side would prevent "reverse polarity". (There are also differences between the contact on rechargable versus non-rechargable batteries, but that's beyond discussion here.)

This is showing up as a solid box when I import it... any ideas?

Thanks for sharing this! It was really great being able to have a battery pack in my hand 45 minutes after I realized that I needed one.

Can you add the tag customizer to this thing http://www.thingiverse.com/tag:customizerhttp://www.thingiverse.com/tag... so I can use thingiverse customizer to change design?

I didn't have the right screws, but scaling up by 1.05 allowed me to make it work. I also had sharp tipped screws so I put some scrap on the ends. Worked out really well for my kids science project.

Would someone be willing to make a 6 cell version and upload? I'm not an opencad user... :-D

It could be added the option to screw on the battery pack directly into our designs...

I think I'll explain myself better with an image

This part is freakin great! Now if you'd just sign up with Flattr... :)

I added a variable to make a longer case for 2 AA's or anything.

Under "Implementation" it now reads:

//-- Battery dimensions: series, width, height and length. Change ser for batteries in series along the case.





I wanted to make a pointer kind of thing.

Your contribution has been added to the main file. I have uploaded a new version. Thank you very much :-)

Great contribution! :-) I will add this feature to the code. Thanks a lot!

I was able to use this for min21 batteries as well where MIN21 = [ 10.2, 29.5 ];

What's got me excited is how easily people will be able to merge these with robot designs. The vitamin list for an arduino servo bot is now:


*2 Servos

*Nuts and bolts


It may be nice if the entire unit was longer so the head of the screw could be on the inside with the nut , then you would have a stud sticking out for attaching the wires.

Yes. That's the reason why I have also parameterized the wall thickness. Now the fr_thick parameter is 3.5 (the front and rear walls, where the screws are located). It can be change to another value (for example 6) so that the screw's head is in touch with the wall.

the bolts wouldn't hold the batteries in with that setup. you could use long set screws with allen heads (like the bolts that hold the pulleys on the stepper motors but much larger

Yes they would! You would still be able to turn the bolt to tighten the battery.

This is intense! I love how quickly these printable battery packs are evolving!

I know, right? 3D printer owners not only don't need to buy battery packs, but they can merge battery packs /right onto/ anything they build!