LFP Battery Box 32Ah with BMS
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This is a custom box for a 12v (12.8v) 4 cell LFP battery using a JK BMS.
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- Printables
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- Electronics
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- Creative Commons — Attribution — Share Alike
I wanted a smaller battery box that I could into the field with my radios, I settled with 32Ah cells so I could have 30A (1C) output.
I had quite a few iterations I optimised the build for easy printing (all flat parts), the result of that is that it ends up not being a very clean build, using lots of different screw sizes and the use of inserts. I'm happy with the end result, but here be dragons (during the build).
Expect to use M2.5, M3, M4 and M6 sizes and inserts.
Besides the screws it also needs a copper bus bar, connectors (XT60 and screw type) and a fuse (35A), I used a regular bus bar that is used to join 330Ah LFP cells as I have a ton of these lying around (battery boxes come with bus bars and batteries also come with them).
Otherwise it's very simple to print and it works on a mini, please use PETG.
I also used some foam on the inside to pad around the battery, the BMS is fixed using two screws.
The top panel is meant to be replaceable so you can use different connectors.