Stephen, nobody really trusts these charge cables going into our PC's. We have all heard the stories of the cable/plug melt down and going back into the PC to do more damage. That's why many of us (if not all) has either the Syma A/C charger:
OR, the A/C USB charger:
I cannot comment on the Syma A/C charger but, I have A/C USB charger (similar to the one in the link) and it works good. Charges my S107; 5 minute fly times; in about 30/40 minutes.
You will never worry about your PC again