You need to experiment:
With the power off: Plug in your device and see if it charges.
Turn the power on and see if it still charging.
Turn the power off and see if it is still charging
Turn the power on and see if it is still charging.
By sheer coincidence I found a Youtube video last night where a person complained: My phone is charging. I stop the vehicle and go into a store. When I return I find the charging has stopped!
It might be that with the power off the phone does not charge.
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