Bringing my old cordless screwdriver back to life! The original Ni-Cd batteries were completely dead, so I rebuilt the pack using recycled lithium cells. My first upgrade worked, but I skipped the BMS… not the safest idea. In this video, I redo the upgrade properly with a 3S lithium pack, a full BMS for protection, and a battery level indicator.
🔧 What you’ll see:
Disassembly of the old screwdriver
Removing the original DIY pack
Testing and matching reclaimed lithium cells
Installing a 3S BMS (overcharge, over-discharge, balance protection)
Adding a charge level indicator
Reassembly and load testing
Now the tool is more powerful, lighter, and much safer — and it gets a new second life instead of going to the trash.
⚠️ Reminder
If you work with lithium cells: always use a BMS. Recycling cells from vapes or laptops is great, but test them first.
👍 If you enjoyed the project, hit Like 🔔 Subscribe for more DIY repairs 💬 Drop a comment if you’ve ever rebuilt a battery pack — I’d love to hear your experience!
Bringing my old cordless screwdriver back to life!
The original Ni-Cd batteries were completely dead, so I rebuilt the pack using recycled lithium cells. My first upgrade worked, but I skipped the BMS… not the safest idea.
In this video, I redo the upgrade properly with a 3S lithium pack, a full BMS for protection, and a battery level indicator.
🔧 What you’ll see:
Now the tool is more powerful, lighter, and much safer — and it gets a new second life instead of going to the trash.
⚠️ Reminder
If you work with lithium cells: always use a BMS.
Recycling cells from vapes or laptops is great, but test them first.
👍 If you enjoyed the project, hit Like
🔔 Subscribe for more DIY repairs
💬 Drop a comment if you’ve ever rebuilt a battery pack — I’d love to hear your experience!
user13