Part of the USB spec handles overcurrent and shorts so I'd try the splitter.
Didn't know where to post this. This forum seems as good as any. I have Toyota Tacoma Truck with 1 USB port. Can I get a splitter cable or use a usb hub to add a second usb cable? Will it charge 2 things? The cell phone connects with Bluetooth but is plugged in to charge. Then we have an iPod I plug in to charge and to play though the truck speakers. Just tried playing it plugged in. It was great. Had good controls on the truck display, even better than using the iPod directly. Much better than bringing the extra bluetooth speaker and taking up a cup holder space.