How To Boost your battery life with Battery Doctor

 When you run Battery Doctor, it will display your remaining battery and usage time. Tap this option to see how different actions can affect the estimate, for example, talking via 3G or playing music. Tap the big green Save Juice button and Battery Doctor will scan your phone's current settings, give you a score, and let you optimise your settings to improve it.

 The pull-down tab lets you save power by turning off various features, such as Wi-Fi, Vibration, GPS and mobile data transfer. It also lets you change the brightness, volume, screensaver time-out and other settings. The Charging button tells you how long it will take to fully charge your device, and lets you view a monthly charging report.

 The Mode button lets you switch between different power-saving presets (you can schedule these to happen automatically at set times), while Rank shows your 10 most power-hungry apps. The cog button lets you configure saving and charging options, and personalise the app, such as by deciding whether it shows a low-power notification.