The iPhone has an ambient light sensor that adjusts the brightness of the screen based on the light around it (when there’s more ambient light, the screen needs less power to be visible). Turn Auto-Brightnesson and you’ll save battery because your screen will need to use less power in bright places.

You can control the default brightness of your iPhone screen with this slider. 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.

Bluetooth wireless networking is especially useful for cell phone users with wireless headsets or earpieces. But transmitting data wirelessly 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.

The iPhone 3G and later models can take advantage the speedy 3Gcellular phone network. Not surprisingly, using 3G requires more battery life to get the quicker data speeds and higher-quality calls. It’s tough to go slower, but if you need more battery, turn off 3G and just use the older, slower EDGE network. Your battery will last longer (though you’ll need it when you’re downloading websites more slowly!).

The other kind of high-speed network that the iPhone can connect to is Wi-Fi. Wi-Fi is even faster than 3G, though it’s only available where there’s a hotspot (not virtually everywhere like 3G). Keeping Wi-Fi turned on at all times in hopes that an open hotspot will appear is a sure way to drain your Acer as07b51 battery life. So, unless you’re using it right this second, keep Wi-Fi turned off.

One of the coolest features of the iPhone is its built-in GPS. This allows your phone to know where you are and give you exact driving directions, give that information to apps that help you find restaurants, and more. But, like any service that sends data over a network, it needs battery power to work. If you’re not using Location Services, and don’t plan to right away, turn them off and save some power.

The iPhone can be set to automatically suck email and other data down to it or, for some kinds of accounts, have data pushed out to it whenever new data becomes available. You’re probably realized by now that accessing wireless networks costs you battery life, so turning data push off, and thus reducing the number of times your phone connects to the network, will extend your battery’s life. With push off, you’ll need to set your email to check periodically or do it manually (see the next tip for more on this).

The less often your phone accesses a network, the less battery it uses. Save battery life by setting your phone to check your email accounts less often. Try checking every hour or, if you’re really serious about saving Acer as07b42 battery, manually. Manual checks means you’ll never have email waiting for you on your phone, but you’ll also stave off the red battery icon.

You can set your iPhone to automatically go to sleep – a feature known as Auto-Lock - after a certain amount of time. The sooner it sleeps, the less power is used to run the screen or other services. Try setting Auto-Lock to 1 or 2 minutes.

The iPod app on the iPhone has an Equalizer feature that can adjust music to increase bass, decrease treble, etc. Because these adjustments are made on the fly, they require extra battery. Turn the equalizer off to conserve battery. This means you’ll have a slightly modified listening experience – the battery savings might not be worht it to true audiophiles – but for those hoarding battery power, it’s a good deal.