My motorcycle of course has a 12V battery.
I have been informed that the OEM Honda cigarette lighter is wired with an "inline 1A fuse".
I'm considering ordering a phone charging USB adapter to insert into this cigarette lighter. The USB device has 2 ports; one is rated 5V/1A and the other 5V/2.1A.
Because the charger is stepping down the battery's 12V -> 5V, does this mean I can still use the 2.1A port to charge my phone without blowing the inline 1A fuse (because 2.1 x 5 W < 12 x 1 W)? Or is it as straightforward as: I may safely use the 1A port only and not the 2.1A port?