Turn off Wi-Fi: If you know you’re not going to be using Wi-Fi, you can turn it off to save power. Go to Settings > Wi-Fi and set Wi-Fi to Off. Note that if you have iPad with Wi-Fi + 3G and use it to browse the web, battery life may be improved by using Wi-Fi instead of cellular data networks.
Turn off 3G (Wi-Fi + 3G model): Using 3G cellular networks when you’re out of range of Wi-Fi connectivity allows you to stay in touch but may also decrease battery life, especially in areas with limited 3G coverage. To disable 3G, from the Home screen choose Settings > Cellular and set Cellular Data to Off. Note: You will no longer be able to send or receive data via a cellular data network.
#1. Disable 3G functions – The 3G Internet connections can also run down batteries of those iPad models utilizing an always-on 3G network. If you think you do not need to be online, then you can save more battery by turning off the 3G function of the device. In order to turn 3G off, go to the Settings app menu, select General, then Network and finally switch 3G to off mode.
#2. Disable Wifi – Enabling of the Wifi network can also drain the iPad’s battery. This is regardless of whether you are online or offline. Thus, if you are offline and do not plan to go online for some time, then you can temporarily disable the Wifi function. This way, you can save more battery life. To disable Wifi in the iPad, tap on the Settings menu then go to Network. Select Wifi option and switch it to off mode.
1. Turn on Auto-Brightness
The iPhone has an ambient light sensor that adjusts the brightness of the screen based on the light around it. Turn this feature on and you’ll save battery because your screen will need to use less power in bright places.
Find it in Settings -> Brightness
2. Use programs with 3D less often.
Not surprisingly, I’ve noticed that when I play games rendering 3D, battery life drops. Using the graphics chips more intensely will crank up power usage, but maybe the drain is also because of the nature of gaming
3. Reduce Screen Brightness
Users can control the default brightness of the screen. Needless to say, the brighter the default setting for the screen, the more battery it requires. Keep the screen dimmer to conserve more of your battery.
Find it in Settings -> Brightness
4. Turn Bluetooth Off
Bluetooth wireless networking is especially useful for cell phone users with wireless headsets or earpieces. But transmitting data wireless takes battery and leaving Bluetooth on to accept incoming data at all times requires even more juice. Turn off Bluetooth except when you’re using it to squeeze more juice from your battery.
Find it in Settings -> General
5. Turn Off 3G
The iPhone 3G and later models operate on two cellular networks, EDGE and the faster 3G. Not surprisingly, using 3G requires more battery life to get the quicker speeds and higher-quality calls. It’s tough to go slower, but if you need more battery, turn off 3G and just use EDGE. Your battery will last longer (though you’ll need it when you’re downloading websites more slowly!).
Find it in Settings -> General -> Network
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