Stap-Together Battery Leveller
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Allows charging one battery from another, restarting a BMS-managed battery that shut off due to low voltage
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Updated at source:
Model information
- Source
- Printables
- Category
- Other Gadgets
- License
- Creative Commons — Attribution — Share Alike
Update August 7 2026
I printed the box and lid in ASA and the snaps didn't connect and hold, so I've made a version (labeled "Battery Leveller Fixed") with tighter snaps that worked well. The lid fits very snugly and is easily pried off with a putty knife.
I needed a way to safely connect together two 12V volt batteries. Sometimes it's needed to charge a battery from another, or reset a shut-off BMS managed battery. I also need it to supply supplemental 12 volt power.
The model is designed for printing in ABS, with the parts snapping together easily
The clearance between the lid outer wall and box inner wall is 0.3mm on all sides for a comfortable fit
The snap dots are 3mm half spheres
solids emerge 0.5mm above the lid outer wall
holes sink 0.8mm into the box inner wall
snapping and unsnapping is easy, and the lid stays put
The voltmeter is https://a.co/d/4nqidkz
The quick disconnect cables are: https://a.co/d/5DuZSeF