Multiwii config "volt" does not match serial output

[GoogleCodeExporter]

The voltage reading in the Config program does not match any of the things I 
use to view serial info from the board.

What steps will reproduce the problem?
1. Connect a battery to the multiwii a0 input on voltage divider
2. Set VBATSCALE so that the correct voltage shows in the Conf program
3. View voltage on a serial device like Multiwii OSD or EZ-GUI and see that it 
does not match. VBATSCALE must be adjusted differently to work on other serial 
devices.

What is the expected output? What do you see instead?
Expect to see the same voltage in my OSD and the Config program but instead 
they are different.

What version of the product are you using? On what operating system?
MultiWii_dev_2015_01_24__r1739
Windows 32 Multiwii conf. VS (MultiwiiOSD 1.2 and EZ-GUI Ground station 
3.126.187)

Please provide any additional information below.
VBATSCALE seems consistent between softwares. But the actual read voltage is 
different in the config program.

Original issue reported on code.google.com by [email protected] on 19 Feb 2015 at 2:13