Alve,

It appears the Digeplayer XT has a battery life of 13 hours.

From your post:

So the Padres traveling contingent of 120 leaned back in their seats and were given several choices on how to pass the time. Every passenger was handed a Digecor XT festooned with the MLB China Series logo, enabling movie buffs to watch “Michael Clayton,” “Juno,” “3:10 to Yuma” and “The Assassination of Jesse James by the Coward Robert Ford,” in succession, or to watch a single “Family Guy” episode 26 times.