Additionally, it can sustain up to 10 hours of video playback or 40 hours of audio playback.

Samsung says that its 4000 mAh battery will give it 7 hours of video playback or 10 hours of talk time.

Powered by a rechargeable battery, this SanDisk media player provides up to 24 hours of audio and 5 hours of video playback.

Motorola rates it at almost 11 hours of talk time, and in our tests the phone clocked just over five hours of video playback.

When playing video, we were able to get 7 to 8 hours of video playback with Bluetooth on and the screen cranked to maximum brightness.

The 60-gigabyte model ($400) holds twice as much, but manages three hours of video playback.

This Apple iPod gives you 36 hours of music playback or 6 hours of video playback on a single charge.

Media mavens will get up to 40 hours of music or 10 hours of video playback.

The battery gives it 6.5 hours of video playback or 16 hours of audio playback time (with the screen powered off).

Ten hours of video playback ... are you planning a presentation or a filibuster?