At 19:28 14 September 2009, Martin Gregorie wrote:

Bottom line: if one of these power supplies can power/charge a device
through its USB port then it can power/charge ANY OTHER device that can
be charged via a USB port: the USB 2.0 port specification says that the
socket must be able to supply up to 800 mA at 5v, so it figures that any

USB connected device must be able to be charged from such a port and/or
to be powered from it.

Not true Martin. The HP310 has a non standard usb port. A standard charger
will not charge the device in use unless a non standard cable is used.

Jim