[jaguar12]

It does charge via the USB cable, and I've had no problems with it. As far as I can tell it doesn't take any longer to charge than using the wall connector.

The only issue is that you can't listen to music while charging through the USB. You can if charging with the wall charger.

However, it is very easy to rig up a separate USB charging cable that plugs into the socket where you normally plug the wall charger. Just search the H10 forums for more info. This allows you to charge the battery via USB and listen to music at the same time. It will probably take a bit longer to fully charge since you're playing music at the same time.

I never have both USB cables connected at the same time, just in case I overheat the battery, although it may be OK. It would be like having the standard USB cable plugged in and connecting the wall charger at the same time. Better to be safe though.