1) That sounds cool, I had never thought of nor used such a device, but Google brings up some interesting options (most of which admittedly look to be a few years old). 2) I am unsure... they do not have the same model number though. 3) No 4) No 5) No 6) Unsure but I've not found the battery to be all that bad... I rarely bring the charger anywhere. I do bring the sheet battery with me and I'm sure to set the power plan to "Power Saver" if I know I'll be out all day though. The Duo handles a full work day easily with the sheet battery attached.