Alaska Air's portable video player

These days most big planes have video screens built into seat backs or armrests — or at least they should, if they expect to remain in business.
Some airlines hook these up to satellite TV feeds, while others have touchscreen-driven video (and music and games) on demand systems. But what about long trips on small planes — say, a trip across the States on a 737 or an Airbus A300?
Because they only have small planes that can't fit seatback video systems, Alaska Airlines is now renting out personal video players on longer flights. The digEplayer 5500 has a 7-inch 16:9 widescreen LCD and comes loaded with about 10 movies, a few TV shows, and over 100 songs, which should be more than enough to keep you busy for the duration of your flight, and is probably more than the poor battery can handle (heaven knows our laptop batteries are looking pretty low after just an hour and a half of watching DivX movies). Anyway, this player must have one helluva battery if it's supposed to last for an entire crosscountry flight.