Wonder if @jzeph89 FRIED his M2 with this? 
The specs state the battery can output 5v (which is fine), 9V and 12V which are not fine.
Or does it not work this way? Does the battery (or device) autosense which voltage to use?
I can find just a strictky 5V max battery bank output… but most new ones have more higher voltage and amp options.