From the manual mate:
For connecting a 2-6S LiPo battery (25V MAX). Used for voltage monitoring ONLY. Will NOT power the board or accessories.
That is the battery pin entry. It is only used for monitoring the voltage, it does not power the board. If you do not connect those pins, it will not monitor the voltage but has no bearing on how he board is powered or flys.
(The one thing that is a little ambiguous is the evo does not have pads called vbat. There is no such entry in the manual or lettering on the silk screen, however the pads that are called vbat on other boards are the battery pads on the evo
To actually power the board, again from the manual:
Connect only one 5.0v SOURCE of power to the VIN pins / Do not connect more than one SOURCE of
power to two or more of the VIN pins
Do not connect SOURCES of power to the pins marked with 5v. They are OUTPUTS for supplying power
to other devices.
Do not connect a LiPo to the 5.0v VIN pins.
Think you just did
When people talk about 12V and 5V they are generally referring to regulated 12V or 5V supplies not the raw voltage from the battery. Think that is where the confusion is coming from.
That's a good point, when we are talking 12v we are talking a reg, a 3cell lipo will start at 12.6v and will tail off during flight to 10.5v or less (hence the need for voltage monitoring)