Cord to Cordless Vintage Reciprocating Saw Conversion - No Winding

I found this vintage tool from Japan recycle shop. It is a 100V 570W reciprocating saw made in Japan. There are 2 reasons to encourage me to do this project. It doesn't work anymore, while all gearboxes are remaining good, this is the first reason. The second reason is aluminum case, aluminum case power tool is not easy and safety to use.
* Electric Reciprocating Saw Information *
- Brand Makita
- Model 4315
- Voltage AC 100V
- Ampere 6A
- Power 570W

I hope you find this video useful and enjoy it!
Furthermore, I am happy to receive feedback, suggestions to improve myself.
!!! I'm sorry for the mistake if I did in this video !!!
Thank you very much for choosing to watch my video!
Have a nice day
Gear Show