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kk2 voltage reading is wrong

I have a kk2 board flashed to the latest and the voltage reading is low from what the battery is actually reading. I've tried it with may batteries. Is there a way to calibrate the sensor on there? is it a bad connection or something? It is almost off by two volts.



Misfit Multirotor Monkey
My KK2's vary by around +/- .2V.

I have seen a fully charged battery 12.6 on my charger read as high as 12.7 on the KK2, and as low as 12.4.