Originally Posted by crm4
Thanks for the explanation.
But risk 4 (permanent damage to motherboard) really is just theorical or real life?
I mean, as it ever happened to multiple peoples who related the problem, or even maybe to someone who read this message?
There are not many devices out there that will ever draw more than 500mA from a USB port - any standards compliant device that is capable of drawing more power should have a way of determining if it is on a USB port or some other charger (as the S2 does).
I have never seen a PC motherboard damaged in such a way, though I have (occasionally) seen USB ports blown out on motherboards due to "reasons unknown", so the risk does seem to be pretty tiny, especially on a good motherboard, but still, you asked what the risks were, and now it is your choice.
When it comes down to it, you can charge your phone fully from 0 - 100 in about 6-7 hours from a PC, or a lot less if you're just topping it off - is the couple of hours you could save that important, that you can't just go out with a phone at 85%, or plug it in a little earlier while you're at the PC?