I found these 10 great tips for extending iPhone 3g battery life for all my iPhone toting friends over at Gizmodo (by the way… these tips also apply to a first generation iPhone running OS 2.0.):
1. Turn down the LCD. The new iPhone’s screen is brighter, but you shouldn’t be running this thing at full heat if you want to save battery power.
2. Wi-Fi new network scanning off or Wi-Fi off. While you’re not checking data for more than a few seconds at a time, I’d turn off Wi-Fi and in general, I’d turn off Wi-Fi scanning. It uses less power than EDGE or 3G but when you’re not using your network connection, you might as well shut it down. Change this under Settings -> Wi-Fi. Same goes for Bluetooth.
3. Toggle off 3G till ready. Use 3G for browsing, YouTube, app store purchases when not around a computer, or during important calls. For all other uses, including email, weather checking and Twitter, etc, use EDGE.
4. Turn off Vibrate in Games.
5. Limit use of A-GPS tracking. GPS tracking is still pretty useless after you’ve gained your bearings, since there isn’t a turn by turn navigation mode for driving.
6. Buy Apps and Songs in iTunes. Buy Apps at your computer and sync them to your iPhone. As an added bonus, you’ll be picking up a charge while you’re tethered to your computer.
7. Set the Autolock to 1-minute.
8. Use programs with 3D less often.
9. Set Push to Off, and Set Fetch Time. If you seldom update your contacts and calendars, you might even be better off syncing by cable to iTunes, while you pick up a charge.
10. Stay Juiced. If you’re at computer or in a car, you should try to use a cigarette adapter or USB cable to pick up a few minutes of charge. Every bit helps!
Read the entire article HERE.