Disclaimer: Electronics repair comes with serious risks, do not attempt if you are uncomfortable or inexperienced with soldering or circuits. Lithium batteries carry their own risks: if short circuited, melted, punctured, crushed, immersed, overheated, etc they may catch fire or explode. Even if you are safe, your equipment may end up more damaged than when you started. Attempt at your own risk!
I soldered in a new switch for my ESC. That's it. Up until this point I was turning it on with the programming box, when it's hooked up to the programming and you apply power with the jst-xh connector from a lipo battery to the box it turns on, but there's no way to enter calibration mode without this button.
Switches: amzn.to/3rvIwSG