Here's our Hardware Tip for.. March 17, 2006
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Multifunction Mobile Devices: Shorter Battery Life
Thoroughly investigate the battery life on any multifunction mobile device you are considering. You'll likely find the battery life of a multifunction mobile device shorter than that of a single-function mobile device under normal usage.

It's obvious, but easy to forget; If you're playing MP3 music for a half hour and then make a cell phone call using the same device with the same battery, you're draining that battery at a very rapid rate. Prepare yourself for shortened battery life by buying a spare battery pack for your multifunction mobile device.