27 days ago

@Bryn-Thomas
The second one os a bit newer then the one above. I did not now there where more then one charger. And it does not look like it has a fuse.
And indeed, the first one I have on my bike.

What I read about the USB charger you use;
Quick Charge 2.0 (5V-2A, 9V-1.67A, 12V-1.5A)
So, if I'm correct, most smartphone charge with a 5 volt so it can only deliver 10W on the 5V and that is not a lot.
(I did not do a complete research so maybe iPhones can charge with 9v or 12v)
10W is probably not enough for using MRA next.
And of course your cable from the charger to the phone is important as well.

The charger I use (with the 3 way switch) has a 5v -3a = 15W output.
And that seems enough to charge the phone while using MRA next.

The first thing you can try is changing your USB charging cable to see if that is the problem.
Otherwise you can try to buy the other QL charger. Then your are fully protected.