I've read the instructions and searched this forum, but have been unsuccessful in finding an answer to my problem.
I'm running a 4 cell 5000 maH battery that measures 16.8 Volts when fully charged and plugged in to my 3DR Hexacopter equipped with an APM 2.5 controller.
I've measured the BEC voltage from the ESCs going to the APM input at 4.92 volts.
Now my problem:
In the Calibration box, there's a place to enter the APM input voltage. I set that to 4.92 Volts. There is another place to enter the measured battery voltage. I entered 16.8 Volts.
When I click to another function in MP and then return to the battery monitor setup, the 'Measured battery voltage' is never saved. Each time I do this, my original setting of 16.8V is gone there is some random voltage in its place. Plus the box is greyed out so nothing can be entered. The APM input voltage stays at what it's supposed to be.
Below is what I see after I've entered all the settings, gone to another routine in MP and then returned to the battery monitor setup... In this case it says 20.308V but it is different each time I look at the battery monitor page.
Any ideas of how I can get the Measured battery voltage setting that I enter to stay ??