Battery® will guide you through the process of optimizing iPhone power consumption. This will save you time and more importantly, make the iPhone available when you need it most.
When you are boarding a plane, running between meetings or anywhere that you do not have access to power, every last bit of battery life matters. Getting the most out of your iPhone battery will allow you to make that call, read that e-mail, access the Internet or play that game when you really want to.
→ ⚡ Battery ⚡ ←
This option will allow you to monitor your device battery level. It allows you to have a estimate of battery left for some functions such as Audio Play Back, Talk Time over 3G etc. Also the battery monitor tells you the percentage of your battery left.