Do you think it would be worth while to power the Phantom tx from the output power connector from a Black Pearl monitor? My thoughts were that the monitor displays the battery level where you really never know for sure about the amount of power left in the batteries in the transmitter. It would require a 6 volt switcher power supply to be added to the transmitter to reduce the 12v output from the Black Pearl monitor. The power requirement of the transmitter seems low enough where I wouldn't think it would drain the Black Pearl battery that quickly. I would think you would be able to get a few flights before needing to recharge the battery.