Many people are reporting that the recent batch of Betaflight F3 boards is reading current and mAh incorrectly. I'll tell you why I think this is, and give you the fix. The fix is to adjust the "scale" value in Betaflight Configurator. I'll show you how I determine what the correct "scale" and "offset" value are, so that you can calibrate your own current sensor, whether you have a Betaflight F3 board, or some other board.