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20000 mAh Powerbank
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20000 mAh Powerbank with 21700 Li-Ion Akkus
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Updated at source:
Model information
- Source
- Printables
- Category
- Electronics
- License
- Creative Commons — Attribution — Noncommercial — Share Alike
ATTENTION: Strictly avoid short circuit and wrong polarity !!!
Part list:
- DIY powerbank modul 2.4A (e.g. from ebay)
- 4 Samsung INR21700-50E (21700, 5000 mAh)
- 4 hex screws M3 x 6
- 4 insert nuts M3 x D4 x L5
- 1 m flexible cable 0,75 - 1 mm²
- 2 mm foam rubber
Printing parameters:
- Resolution 0.2 mm
- 2 Perimeters
- 20% Infill
- Supports
Assembly:
- Print all parts
- Check fitting of knob
- Check fitting of modul
- Check fitting of holder
- Check fitting of akkus
- Insert nuts with solder iron
- Plane contact surfaces of case and lid with sand paper (600, wet)
- Connect all negative akku poles with 11 cm cable (see circuit plan)
- Connect all positive akku poles with 11 cm cable
- Solder cables to modul (13 cm positive cable, 21 cm negative cable)
- Insert knob, modul and holder
- Solder negative cable to akkupack
- Pull negative cable loop and positive cable with a hook through center hole
- Insert akkupack
- Solder positive cable to akkupack
- Add some 30 x 30 mm foam rubber pads
- Close lid with four screws
Have fun !!!
Updates:
- 2022-02-04: Greater hole for iPhone plug
- 2022-02-10: Optimized PCB holder
- 2023-01-13: Include STEP files for remixing