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I have not yet got a QMX+ but in the meantime I have been reading and wondering about power supplies.? Has anyone tried a LIpo 3S battery, nominally 12.6V wehn fully charged and drops to about 11V when discharged to a safe voltage?

Is there any advantage/disadvantage of running either 9V or 12V?

There's lots of discussion on here regarding QMX power supplies and you'll find almost as many different opinions as there are responses.

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Taking a step back from the noise, the general message (including info from Hans himself) is that it's fine to power the 12V QMX with over 12V BUT as the voltage increases, so does the risk of popping output transistors if your radio isn't running into a well-matched load. How much you go above 12V is entirely down to how long you want the radio to survive.....?

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I run my 12V QMX from either 3 x 18650 LiPo cells or a 3S LiPo pack. Fully charged, the radio reports these as supplying about 12.5V ish which drops fairly quickly. I've had no issues so far in running it that way.

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When I first built the kit and connected to it via putty, I saw that the terminal software displays the supply voltage to the radio. When the supply voltage hits 12.5V and above, the displayed numbers turn red. I used this as a general indicator that the radio is safe enough when run at 12.4 and below.?

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Anyway, long story short - Yes. A 3S LiPo is fine for a 12V QMX ....... in my experience.

I use a 12V UPS run by 2x 18650. These have a 5V USB socket which you can connect to a charger or pc. Mine runs 24/7 with no problems.? ?You can get these UPS from online sources for just a few bobs. You will need a special charger for LiPo batteries.?