Source is Gamespot.
Q: How long does the PSP\'s battery last?
A: The short answer is that it depends on what you\'re doing. The longer answer is that Sony has stated that the battery should last around six hours. With simpler-looking games, like Lumines or Mahjong Fight Club, that definitely seems to be the case. But with more graphically intensive games, like Ridge Racers, the battery doesn\'t last quite as long. Based on our estimates and a few battery-draining tests, Ridge Racers seems to last somewhere between 90 minutes and three hours. Playing with the wireless networking switch flipped on will also further reduce your battery life. The system has an auto-sleep function that stops the wireless drain, but that switch is there for a reason. Turn it off when you\'re not using it.
Video and audio will likely drain the battery differently, depending on where the content is coming from. It\'s less power-intensive to read from the memory stick slot than the universal media disc drive, though without any audio discs and only one demo video disc full of short games and movie trailers available now, it\'s difficult to actually put a number on this. Considering that the screen will black out if left unattended, it seems reasonable that you should get a good amount of battery power out of the system when listening to audio.
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