PSP battery life exposed!

Sony has finally come clean with the details concerning the PSP's battery life.  We'll just keep this short n' simple ... the lithium-ion battery will provide 4-6 hours for games, and 4-5 hours for videos.  According to Sony, these ranges were obtained by adjusting the PSP's luminance from max to min, while the volume was set at mid-level with headphones plugged in, and no wireless LAN connection made (presumably, LAN play will eat up the battery faster).  At any rate, a spare battery can be picked up for an extra $45, which definitely seems like a viable option.