An anonymous reader writes with this excerpt from the Opposable Thumbs blog:
"The battery in the Nintendo 3DS is as bad as we had feared, and it's a major impediment to enjoying the system. ... With the screen at a reasonable brightness, 3D and wireless turned off when the game allowed it, and no sound, we were about to get to a little over 4.5 hours of playtime. If you like a brighter screen, keep 3D turned on, or if you have that speaker going, that time is only going to go down. ... Using the cradle whenever the system isn't being played is a habit you're going to want to pick up, especially with a charging time of around three and a half hours."