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Carry An Extra Battery
If your business trips are full of busy-ness, you may not have the time to stop and recharge your phone during the day. Even a car charger or a five-hour battery might not be able to go the distance on a 12-hour day spent in conference calls, interviews from your hotel room, or emergency meetings from the airport lounge.

Smart business travelers will pack an extra battery, especially for phones with a high-resolution (read "battery-draining") color screen. If you don't mind adding a some extra weight to your Treo, BlackBerry or other type of smartphone you can also purchase (from your provider) an "extended" battery, which is larger but increases your handset's talk and standby time performance.

Maximize Battery Performance
Your smartphone's camera or video features are fun to use, but they're also a heavy drain on your battery. If you want to increase the value of a single charge—for instance if you're traveling and will be unable to re-charge for a day or two—avoid using these power-sucking features. Gaming and Web browsing also eat up battery much more greedily than talking or IM'ing, as does using Wi-Fi or Bluetooth.