20V Bauer Battery Adapter with 2020 extrusion mounting
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Adapter to use 20V Bauer (Harbor Freight) batteries for projects with cell breakout pins.
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- Printables
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- Electronics
- Licencja
- Standard Digital File License
Originally for my 3D printer backpack, this adapter can be useful for anyone that will be using it to power other devices (Power Wheels, Motors, USB devices with buck converters).
!!!LITHIUM BATTERIES WILL CAUSE A FIRE IF MISHANDLED OR SHORTED!!!
PLEASE USE AT YOUR OWN RISK! USE FUSES AND OVER CURRENT PROTECTION AND OVER DISCHARGE PROTECTION, THERMAL PROTECTION IF POSSIBLE. RECOMMENDED PRINTING WITH HIGH TEMP ABS/ASA OR FR MATERIALS IF POSSIBLE.
AVOID SHORTING BATTERIES DURING ASSEMBLY. USE ORIGINAL CHARGERS TO BALANCE CELLS, DO NOT USE THIS ADAPTER FOR CHARGING.
I AM NOT RESPONSIBLE FOR MISHANDLING LITHIUM BATTERIES.
Assembly instructions:
- Cut a sheet of 1mm thick brass into 7mm wide strips for the main B+ and B- contacts and 2.5mm wide strips for C1,2,3,4,TH,ID contacts using a carbide blade, a bandsaw, or sheers. Be sure to file them to make them smooth for inserting into contacts. Super glue or epoxy them into place, but please verify they fit the contacts before gluing.
- Verify the pin contact depth of the charger to make sure it matches, I had the pins stick out 9-10mm. I believe the B+ and B- pins should stick out before C1-4 but verify with the original charger pins.
- You can break out the cell voltages for use in a BMS. C1-4 is the taps between cells in series, TH is for a thermistor, I believe ID is a resistor value to tell the tools that a genuine battery was inserted but I'm not sure yet.
- For my project I just used the main B+ and B- contacts and used a low voltage drop out circuit (https://a.co/d/d5BxKlX) to protect the battery going below 15v (3v per cell)
Again, test fit your batteries and contacts before putting a load on them, bad contacts will cause arcing which can cause heat and potentially a fire! These lithium packs have a nominal 18V rating, 20V is fully charged, absolute minimum is 14V for 2.85V/Cell. Bauer batteries do no have built in BMS or protections, the tools do the low voltage cut-outs. Do not exceed these ratings!
I also provided a version without the 2020 extrusion lip, use M5 bolts for mounting.
Restrictive license is due to the risk of lithium batteries and people selling poor quality adapters. I would rather someone disassemble a Bauer tool to reuse the adapter than print this adapter if they don't absolutely know the risks.