This does help tremendously, could you report the battery lifetime one could expect to get running the external battery source you've purchased? (assuming different usage types, i.e. watching a movie, or doing some light work). This would be very valuable information to me, yes I understand that technically it's limited to the number of AA/AAA batteries you're able to carry with you, but I would very much appreciate some quantification (as I'm sure others are also interested about this).

Thanks!