Secret power-saving shortcuts: Six tricks to extend your iPhone battery life

Apple has done a lot to make everything from their chipsets to their software extremely power efficient. Yet battery life remains the currency of mobile and every feature you use, you pay for with power. If you start running low on battery, you can simply plug into USB or an adapter and recharge. (Plug into an iPad adapter to recharge really quickly.) If you're going to be away from power for a long period of time, however, there are a few tricks you can use to extend your battery life just a little bit longer. They'll cost you some fun and convenience, but they'll get you as far as you can possibly go.