W211 12v socket draining phone battery instead of charging?

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SL03WLY

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Dec 6, 2020
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Location
South East, UK
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W211 03'
Anyone else experienced this? I got an iPhone7 and using a random usb charge off amazon. It lights up when plugging in and my phone says its charging, but the battery seems to be going down, despite not using it for anything. I have tried the old trick of rotating the usb socket to get a good contact but no luck. Anyone encountered this issue before?

Note, that I used the same usb charge socket in my other car and it works fine there; charging the phone.
 
What is the state of the car battery? Have you measured the voltage?
 

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