Oh I forgot to add: On the Incredible, the phone saw the USB port on those types of chargers as a USB host (just like it would on a laptop), and would only draw a max of 500ma, regardless of what the charger was outputting. There are 2 pins you can solder together inside the charger, that will will fix that, but it's not the most elegant hack. That's why I ultimately went with a regular non-USB charger. You might want to verify that the S doesn't do the same thing. However it probably does, because it doesn't want to draw it's max input from a USB port on a laptop, if it thinks that's what it's plugged into.