Hi, there
Some info on EVX ESC.
Novak's EVX uses only one battery for BEC and if you connect 7+ Cells then overheating can occur with high-drain servos. To solve this always connect 6 Cells to BEC side and the rest Cells' to other. If you want to use UBEC connect it directly to 12+Cells, not through EVX, unless you open it and solder directly to combo junction.
And there is no 14.4V on any pins of 3-pin cable.
Artur
P.S. By the way, you can improve perfomance of EVX by replacing and changing some of the internals of ESC. Novak EVX is very user-friendly.
I can help with translation if required, but I think most of it clear from pictures.