protosnap pro mini RAW POWER

I am hooking up a 9 VDC battery to the RAW and GND on the new protosnap, and getting erratic behavior (blinking power LED) and/or… SMOKE ! YIKES! If I power back up via the USB, the board is fine, so I am assuming I fried the regulator…but why? Any help…thanks

It should handle 5-12v on Raw, so that seems ok. Was the polarity correct? (+ to Raw, - to Gnd)