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In this video I will show how we can build our lithium battery pack for an old ups. It double up the backup time. I used my Homemade Spot welding machine to weld all the batteries together.

Welding Machine video link    • BUILD A DIY SPOT WELDING MACHINE  

Material Used

1. 18650 Liion cell 2200mah (21nos.)
2. 3cell BMS Circuit
3. Nickel Strip and Spot Welder
4. Insulation Sheet
5. Silicon Wire 12AWG
6. Glue

Thanks for watching this video.