Ryobi 3.6v NiCd to Li-Ion screwdriver conversion

I bought this not working Ryobi NiCd screwdriver without a charger.
It is 3,6v NiCd so I converted it to 4.2v Li-Ion with charge control BMS.
I also converted the light bulb to LED.

[@TheEmbeddedHobbyist]

With the shorted cell, try charging a large cap and connecting across the battery. It may have formed a whisker between the plates, they had a habit of doing this if charged on their sides.

[@DaftOldMan]

Thanks for information. Can't try it because I through it away. An idea for next time.😁