Can send me directions on how to do it? Thanks in advance man! Been looking into this issue
1. There is a video on YouTube how to open the SB. After opening it cut the battery wires. Latter you can solder and seal it.
2. I bought battery from simlim. You can bring your battery pack which you cut out. They charged me $20 for 2x battery. They also have repacking cover buy that also. You need it for repacking. Buy the battery with spot welded connector, easier to solder. they only sell battery
3. Need to open the battery pack carefully since it got BMS board with it.
4. Solder back new battery exactly the terminal as it's with dead battery.
5. Put the repacking cover. Now the battery pack is ready.
6. Solder again to the cut out wires.
7. Test it.
The above steps will be useful to someone who has some hands-on skills else you will break the SB while opening or will spoil the BMS board/battery. Quick soldering is recommended for batteries ...