I use exclusively a power-bank and simple PD trigger cable for my QMX and QMX+ power.? One is 12V, one is 9V.? They work flawlessly.? And the small Anker 10000mAh power banks I use are smaller than the QMX, and have enough juice for several hours of continuous operation.? Don't hesitate to use this very convenient solution.
Stan KC7XE