Did a search looking for this kind of assurance. I have a factory built QMX - I've not been able to use it yet - which I was able to power on using those cheap AA battery banks filled with Duracell batteries to make up the 12v.
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It's a nice little power solution, if a bit of an expensive way to go about it, even if you populate the power bank with rechargable AA batteries. So it was from there I went looking in to a power bank solution.
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Yesterday I purchased an Anker power bank and a 12v USB to DC PD cable (links below). Hopefully these should do the job safely and reliably. I also purchased one of those cheap little voltage testers just to see what power is going through to the QMX from the power bank. I'm not expecting anything super accurate, but hopefully a ballpark visual would be good (linked to it below).
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Voltage tester:
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Power Bank:
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USB Cable:
