Battery Voltage does not read correctly on transmitter or MP

Archive
1

After I charge a battery and see that it is full with 12.6V I place it in My new Iris+. After boot-UP my transmitter reads 1.3Volts low or more (10.9-11.3) This is within a few min of charge and/or the next day. The MP software detects low battery from this number and does RTL on my missions. How do I get the Iris to send the correct data to the MP software and the transmitter. I tried changing the Pin numbers in the param section but to no avail. Has anyone had this happen and what is the fix?

2

You can calibrate the voltage sensor using the instructions at:

http://copter.ardupilot.com/wiki/common-measuring-battery-voltage-and-current-consumption-with-apm/#calibrating_the_voltage_reading