I have 3 of these in different cars, for charging 2 phones at once or in the case of the MX-5 one phone and a dash cam (the socket is hidden in the footwell).
Anker 2 x USB 4.8A charger
amzn.eu/g9gtS8k
Just about keeps up with a Huawei P9 using google maps with the screen on full brightness, but I think that is as much to do with what the phone will draw as with the supply.
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