The battery life of the iPhone has to be one of the biggest complaints and during heavy usage, usually e-mail synchronization and using the phone, you may get 3 or 4 hours max. When I know I will be using the phone heavily, I slip into conservation mode using the following methods. This is usually at a conference or when I know I will not get to charge for a day or two.
This will extend the life for another couple of hours which helps get through the day!
- Turn sound off -If the phone has to make a noise or vibrate, it's using battery life which you want to conserve. So turn it off.
- Do not listen to music. If you need your phone for e-mail or other work purposes, do not deplete the battery just listening to music
- Change E-Mail to manual – If you have your iPhone configured to push e-mail down to your phone real time, turn this back to manual to conserve battery life. Do a manual pull of mail when and if you need it.
- Set Autolock to 1 minute. The longer the screen is turned on, the more it uses the battery. You can of course just put into sleep mode immediately after use as well.
- Turn Bluetooth off if you are not using it.
- Reduce the brightness as far as you can without compromising your eyesight.
- Turn Wi-Fi off if you are not using it as this is a big battery drain.
- Turn 3G off and use the slower speed GSM settings if mobile data speed is not an issue for you.
- Turn off Location Services. You know where the phone is!
At least once a week try to run your battery completely down anyway, then recharge your iPhone to 100%. This will keep your battery in good condition.