Betaflight F3 Inaccurate Current Sensor / mAh Readout (Patreon)

Some people are reporting that their Betaflight F3 boards are reading really low mAh and amps. I did some testing tonight and found that my older BFF3 that's in the Coyote seems to read close to correct with the default current scale of 400. But two boards that just arrived this week read way off. I calibrated them and found that a current scale of 260 for one board and 275 for the other gave correct readings. No change to the default offset of zero was needed.

If your BFF3 is reading way off, try setting scale to between 260 and 275. Checking that the charger puts back in approximately as many mAh as the OSD reports came out is a rough (but not perfect!) way of confirming that the current sensor is correct. For increased accuracy, do a non-balance charge or calibrated using a battery that is already very well balanced and doesn't need a balance charge.