I feared that there was a sweet spot for this in the past. The few modern ones where you can still get to the battery have some proprietary connector with a doz

I feared that there was a sweet spot for this in the past. The few modern ones where you can still get to the battery have some proprietary connector with a dozen pins where I wouldn't even know where to start. The one I had was some Noname device from China that really only had two wires going to the battery pack, which I've never seen on any other Android device yet, so I was quite positive given the cheapness that my simple trick would work, but alas.