Yes, I understand you, but the reality is that we have today in all this type of electronic devices with batteries of this type a charge and discharge controller or BMS/PCB/PCM. You put energy on one side and you take it out on the other, so that energy always goes through the battery so yes, you are forcing the battery for a use for which it is normally not prepared. The same thing happens in mobile phones and many other devices with batteries of this type. There is not really a bypass that allows the energy it consumes to pass through and the rest that is missing or over goes to the battery.
P.D.: The electronic devices that allow you to do this usually specify it. I have a phone gimbal that allows it, or some sports camera also in its characteristics indicates it, and they do it as an added feature and to my understanding very good although the opposite is the most usual, they are not prepared for it.
Now that @arruntus has mentioned this, I have a little Bluetooth speaker with this little tidbit of a warning: “do not charge while in use”. Thanks to @arruntus’ explanation, now I know why.
On the other hand, I do not recall seeing such a warning any of the literature for the H, H520, or Mantis Q. I also have to admit I did, basically, read the manuals cover to cover, when I first received the units.
Can anyone else vouch as to reading, or not seeing, such a disclaimer?
Would be a nice bit of knowledge to have confirmed, as to the capabilities or limitations of the charging circuit and battery interface of our controllers.