If you have an aversion to settings screens and switches, or simply want to monitor battery usage and health, download a battery management app. There are tons of these available, but Juice Defender and Battery Widget Reborn are excellent Android apps, which either automate battery-saving behaviors or simply load you up with relevant data, such as exactly how many hours and minutes your battery has left, and how long it will take the charge to full. iOS battery apps tend to be info-only – Battery Doctor will tell you exactly how many extra minutes you'll get from turning off GPS, but iOS prevents developers from making those changes directly.
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