Powering Pixhawk with Default Power Module

Hey Guys!

I would like to power the Pixhawk with a Default Power Module, but as I know this device should be connected between a 4s battery and the ESC, and it supplies the Pixhawk with the parallel circuit. So my problem is that I will use only 6s and 10s batteries in my system and I won’t have 4s batteries connected to ESC that could also supply the Pixhawk. Would it work if I just connect the Default Power Module to a separated 4s battery but at the other and of the cable, there is no ESC connected?

Thank you in advance,