A fully charged Wii U GamePad will operate for 3-5 hours.
Nintendo said today that each Wii U will support two GamePads simultaneously.
The company added in a full Wii U spec sheet: "The Wii U GamePad controller removes the traditional barriers between games, players and the TV by creating a second window into the video game world.
"It incorporates a 6.2-inch, 16:9 aspect ratio LCD touch screen, as well as traditional button controls and two analog sticks. Inputs include a +Control Pad, L/R sticks, L/R stick buttons, A/B/X/Y buttons, L/R buttons, ZL/ZR buttons, Power button, HOME button, -/SELECT button, +/START button, and TV CONTROL button.
"The GamePad also includes motion control (powered by an accelerometer, gyroscope and geomagnetic sensor), a front-facing camera, a microphone, stereo speakers, rumble features, a sensor bar, an included stylus and support for Near Field Communication (NFC) functionality. It is powered by a rechargeable lithium-ion battery and weighs approximately 1.1 pounds (500 g)."