USB/AUX port-Does it charge?

I have a 2015 with the HD head unit. USB will charge my Gallaxy S4 (but slowly). Music will not play nor does the truck see the device. Bluetooth works fine. Therefore, I don't use the USB.

 

Maybe stupid here so I apologize, my tech skills not the greatest. My USB port on the sr5 16' does it charge . My tablet and wife's phone does not charge while plugged in, does not recognize device when I plug in Samsung tab, there is a red x on my tab displaying not charging, soooo what is the USB port for

 

Transferring files. It gives 0.5 amps. Your tablets and large phones do not recognize that as charging

 

It's just a standard USB 2.0 spec port on the HU. I'm assuming it puts out 500mA. My iPod charges just fine but it's from 2006 and 500mA is just fine for it.

Most phones will charge at 500mA slowly, but 1A is normal for a smartphone. Where tablets usually charge at 2A, but can slow charge at 1A when not being used.

So it's not going to charge a full size tablet, but it should charge a phone (slowly). Perhaps not a new phablet though, but my iPhone 6s charges alright. It's better used for an iPod or data use rather than quick charging of devices. You're better off getting a 2.1A 12V charger to put in the 12V outlet if you want to charge your tablet, or phone quickly.