Is Tx battery voltage read-out adjustable?

The displayed Tx battery voltage on my DEVO 10 is quite a bit lower than the actual voltage of my 2200mAh 3S lipo, as checked with an above average digital multi-meter. It's not a Fluke, but it is not a Harbor Freight freebie one either. Although I have never checked it against a comparable DC voltage standard, I think it is pretty accurate.

Currently(pun intended), my DMM reads the battery voltage as 12.42v, and the read-out of the Tx reads it at 12.24v, a difference of 0.18v. Would that be a reasonable difference as a result of current draw when the Tx is powered up v.s. checking under no load with the DMM? It doesn't seem to affect the Tx displayed voltage read-out, whether transmitting at 100uW or at 100mW, or with the display LED on or off.

Which brings me to the question, .....is there any way to adjust the Tx read-out with a F/W and settings solution, or is it simply a function of some fixed component on the main board that has to be lived with?

No, you can't adjust the value displayed. But it's not all that critical, either. You can set the alarm to whatever value you want, and you'll need to learn to watch for the display voltage getting near it whether the display is accurate or not.

Unless you're regularly taking your battery out and checking the voltage with a meter, the accuracy of the displayed voltage won't matter much. I use NiMH batteries and pretty much never take them out of the Tx.

I've never needed to build from source but it seems like, with the changes in voltage readings I see after some nightly updates, that there's likely a battery scale in there somewhere to adjust the meaning of the voltage divider reading right?

In DeviationFW absolutely MWM is correct- there is no adjustment, but I'm pretty sure it is changeable, weather changing it is practical or not to you is the question (also note, I concur with MWM that the little it's off by is a non-issue, I too use NiMH and charge in the devo and never take the batteries out to measure and have never had an issue...)

Thanks, I don't possess the required skill set to do a rebuild at this time, if ever.

So, I suppose the next best thing to do is to calculate the difference between the displayed voltage and actual battery voltage, lower my Tx's critical low voltage alarm value by that much, and just ignore that the displayed voltage is showing levels, that if were true & actual, would result in LiPo damage. Not ideal, as I think maybe I am sometimes borderline OCD, ....or is that AR?!
WWMD?(What Would Monk Do)

Just for the sake of argument, how difficult would it be to determine corrective values, and rebuild the F/W? Is it something a relative novice could manage? I am not really concerned with accuracy over the entire high to low range of voltage, as I am for just the bottom end that would result in battery damage if allowed to drop too far. Any special software or hardware needed to accomplish a rebuild? Perhaps would only have to do it one time, once the new version of Deviation is released, and if Nightlies are no longer required to fulfill my R/C needs.

Is this where I need to start? >> bitbucket.org/deviationtx/deviation/overview <<

Is there anyone willing to help me (I'm not very code-savvy) get through the process of doing so? I imagine it will be a long, painful process for me, and I don't expect a lot of hand-holding, but I also know that I will hit a lot of roadblocks along the way that I won't be able to figure out all on my own. Gentle nudges in the correct direction would be appreciated.

Yup, that's the instructions that exist.

You'll also want to find a guide on setting up the DSCM mercurial, and then cloning the source from bitbucket. confluence.atlassian.com/display/BITBUCK...th+Git+and+Mercurial looks like a good start, except they tend to push git and we use mercurial.