Hey, all the answers and more 
Ha - perfect. Thank you again - had to order a replacement Boron as mine is now toast so will have to wait to test ha.
Awesome - purchased 2! Looked at the wiring - do you think there is a conflict powering the unit with the 3V3 port? Better to power off external power instead of the Boron?
You cannot use 3V3 as a power input; it is only a power output. See power.
Edit: I just realized you meant the INA219 unit, not the Boron unit. Yes, you can power the INA219 breakout from 3V3.
@bswanstrom, you can power the INA219 board from the Boron's 3.3v since it takes very little current. Also, the INA219 isolates the "high" voltage from the Boron but please follow the Adafruit instructions with the exception that the unit will be powered with 3.3v instead of the typical Arduino 5v.
There is a library adafruit_ina219 library is available in the Web IDE and can easily be downloaded if you use Particle Workbench. I would suggest running one of the included examples to test things first.
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