Note that qc2 and qc4 quick chargers push out up to 20 volts. Qc3 chargers can supply up to 22 volts. There is communication between the charger and the device regarding the highest permissable voltage for that device.

Obviously the Garmin device is female and cannot communicate properly Warning using phone fast chargers for powering Garmin unitsWarning using phone fast chargers for powering Garmin units. This can cause the charger to be set to higher than 5 volts, potentially causing damage.

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