Yannig, what do you have your lower protection voltage parameter set at? (protection menu, min voltage)
It should probably be at 7V.? But this setting should not cause your QMX to "shut off" - just disable TX or flash a warning.
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It is not normal for a QMX to "shut off" at any voltage above about 6.5V.? It will not transmit below about 7V, but the receiver works below that.? So if yours is powering off at 10.5V, there may be some problem with your QMX.? Or maybe not.
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With your battery pack, you may be able to measure 10.5V terminal voltage, but it may have no capacity for current.? The QMX will need up to 200mA at 10.5V in receive mode, and 1A in TX.? So if the battery is near depleted, it may not be able to deliver that current at 10.5V, so the QMX will "shut off".?? The way to test this is to put a mA meter inline, to see the current.? Or when the battery is at a point when the QMX "turns off", take just the battery and do a simple load-test on it to see how much current it can deliver.
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Stan
