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Turn on the Airplane mode
If your battery drains quickly and nothing else worked, you can activate the good old Airplane mode when you don't need your mobile device. It will disable all the major functions of the smartphone (e.g. the calls), but you will extend the battery's life until you plug it in to a charger.
One iPhone service that requires Bluetooth is AirDrop. AirDrop allows you to transfer photos and other files to and from nearby iPhones with the same feature (AirDrop) switched on. Unfortunately, it drains your battery because of the way it seeks out nearby iPhones to connect to.
You can switch off AirDrop in the Control Center (From the Home screen, select and hold the control center ->swipe upwards from the bottom of the screen -> tap AirDrop -> Select OFF). Use AirDrop only when need it.
Siri is a built-in intelligent assistant that enables users of iPhone 4S and later verions and users of newer iPad and iPod Touch devices to speak natural-language voice commands in order to operate the mobile device and its applications.
Even though it is very useful you should disable it if you don't use it, because the sensor which detects that you are holding your phone next to your face and that makes Siri listen automatically, is active whenever your phone is unlocked.
To turn Siri off:
Settings -> General -> Siri -> Make sure that Raise to Speak isn't switched on.
We tend to quit the applications we aren’t using as it seems as a logical way to stop them draining the battery. However, this isn't such a good idea after all.
When you close an application, you remove it from the RAM memory. This means that when you open it again, the mobile device has to load it back into memory. All of that loading and unloading drains your battery.
Applications don't drain the battery when you don't use them. They are not allowed to run in the background unless they are playing music, using location services, recording audio, or checking for incoming VOIP calls (like Skype). All of these exceptions, but the latter (Skype), will put an icon next to your battery icon to alert you that it is running in the background.
Close unnecessary applications (mobile device)
If you use programs that require more effort of your CPU, your CPU will use more power and your battery will drain faster. Run only the applications you need the most so that the CPU doesn't use too much power, and select programs which don't demand too much of the CPU. The less your mobile device has to process, the more power it will save.
Every operating system offers a utility which allows you to check what is draining your battery.
To check what is draining your battery:
Android: Settings -> Power management -> Battery usage (or Settings -> Battery) -> Scroll down to see the list of applications
iOS: Settings -> General -> Usage -> Battery usage -> Scroll down to see the list of all applications
Bluetooth is a short-range wireless technology that allows your laptop to connect with other devices. Via bluetooth you can send and receive files, connect to your car's sound system, use a bluetooth speaker or headphone and etc, and bluetooh is also one of the battery drainers.
Auto-sync feature allows you to synchronize your mobile device with your online accounts (Viber, Skype, Outlook, Yahoo, Gmail and etc.) so that you can easily check for new emails and update your contacts list. Your device checks for new email and contact-list updates even if it is in standby mode, thus draining your battery.
The best solution is to turn this feature off.
Settings -> Accounts -> Tap on the three vertically-aligned dots and uncheck Auto-sync data
iOS you can disable the Auto-sync feature only in iTunes:
iTunes -> Preferences -> Devices -> Tick Prevent iPods, iPhones and iPads from syncing automatically
To turn the iCloud feature off (iOS devices only) go to Settings > iCloud -> tap to turn off iCloud features.