Cord to Cordless Reciprocating Saw Upgrade

I restored this tool once, about 4 years ago. I never used it, but one day I needed it, and it didn't work, the board controller was broken. It's really hard to get a replacement for a broken one in my area. If I leave it like that, it's a waste. So I can fix it by replacing its structure from AC to DC. You can see it in detail in this video. I hope you find this video useful and enjoy it! Furthermore, I am happy to receive feedback, suggestions to improve myself. Thank you very much for choosing to watch my video! Have a nice day Gear Show