I got to thinking (yes, I know this is dangerous) about batteries.

If you have a quad that is designed to run S6 packs and you only have S4s after a day of flying could you use a S4 to get some more stick time? I’m guessing the response would be diminished but it’s still more flying time.

Conversely, would using a S6 in place of a S4 cause problems due to an over voltage mismatch?

I really don’t know enough about this stuff to know what I don’t know…and I think too much

You can always go down, within the voltage rating of your flight controller/esc/aio- if the quad is build for 6s, you can put a 4s battery on it. It’ll just be a bit more tame.

Going up is a different story. If your quad is built for 4s, you can go to 6s IF: your electronics are rated for 6s, AND you set an appropriate motor output limit in BF. For motors rated for 4s, motor output limit should be around 66% to run them on 6s.

You can also set up BF to detect your cell count and change pid profiles depending on whether you plug in a 4s or 6s, and automatically apply the motor output limit when needed:
https://oscarliang.com/4s-6s-lipo-same-m...our%20quad.

Thanks, Lemony. It makes sense but there are so many “variables” in this hobby and I’m lost a bunch of the time.

I guess I need to look into the workings and specs of FCs, ESCs, etc