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V2 - Build a 20000 vs 40000mAh Power Bank from 26650 Battery

How to Build a 20000 vs 40000mAh Power Bank from 26650 Battery at home
- How To Make Mini Spot Welder i Using in video : https://www.youtube.com/watch?v=tPuKu5J-_64

- Parts that you need
- 26650 Battery 4000mah
- Power bank module

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