Repair screwdriver/drill machine - Convert Ni-Cd to 18650 Li-on battery

These are broken screwdriver machines I bought at a scrapstore. I decided to buy it because I thought it might only be slightly damaged and fixable.
Finally, I had good machines to use in future projects
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My english is not good, sorry for that
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Видео Repair screwdriver/drill machine - Convert Ni-Cd to 18650 Li-on battery канала bakidiy