It's possible the brightness settings could have changed in the latest update for iOS 11. Go to Settings, Display & Brightness, and then lower the brightness of the screen. Doing this should improve battery life. Keeping a lot of unused apps on an iPhone could be causing battery to drain. It might be worth it to go through all the apps and see which ones aren't being used. Delete the ones that haven't been used in a while. That should help boost iPhone battery life. Poor Cell Coverage Area, In a poor cell coverage area, If so, your iPhone's battery will be working twice as hard to find a good signal. By turning on Airplane mode, users can boost their battery life. Go to Settings, Airplane Mode, and then tap the Airplane mode icon. Background Activity shows which apps were using your iPhone's battery while using another app. By tapping on the Clock icon, users can see how much time was spent on screen and how long an app was running in the background. Apps like Apple Music, Google Maps, and Mail could be draining your iPhone's battery. Mobile games and dating apps also tend to drain battery life. To disable apps from running in the background, simply go to Settings, General, Background App Refresh, and turn off.
According to Apple, iPhone 7 offers up to 2 hours longer battery life than iPhone 6s, and iPhone 7 Plus offers up to an hour longer battery life than iPhone 6s Plus. But if you’re still having battery life problems then check out the tips below to see how to troubleshoot and fix the battery life issues on your new iPhone. I’ve noticed that people are quite cynical about such articles as most of them tell you to disable features. It is important to understand that your battery life will vary as per your usage, so if you listen to your music locally from the Music app and not stream off LTE/3G/Wi-Fi, your battery life would last much longer. Usage is the amount of time iPhone has been awake and in use since the last full charge. The phone is awake when you’re on a call, using email, listening to music, browsing the web, or sending and receiving text messages, or even during certain background tasks such as auto-checking email. By default, iOS displays the battery level in the top right corner of the status bar.
You can keep track of the charge remaining in your iPhone more easily by enabling the battery percentage indicator, which displays the battery left in percentage. Battery and tap on the Battery Percentage toggle to turn it on. The first step in fixing the battery problems is to understand battery usage. In iOS 8 Apple added the naming and shaming feature, which gives you a breakdown of battery usage by apps. Apple has made some improvements to this feature in iOS 9. It now gives you the amount of time the app was used and the amount of time it was running in the background. You can use that information to identify the battery hogs. This will show you all the apps and internal services like Home & Lock screen that are consuming battery on your iPhone. By default, it shows you the battery hogs in the last 24 hours. You can also check the apps that are consuming battery in the last 4 days by tapping on the Last 4 Days tab as you can see in the screenshot above.
You can also tap the clock icon to the right on Last 4 days to find out how much time you’ve used the apps, and how much time the apps have been running in the background. The battery usage provides you information about how much battery is consumed by various apps and services on your device. It is important to mention here that an app with a high percentage battery usage does not necessarily mean it is a battery hog. It could be because you were using it a lot, or if it was running in the background to upload or download content. The apps that should be a concern are ones that show up on top of power consumption list even though you haven’t been using them. Phone will also tell you what activity that could have resulted in battery consumption such as Background activity in case of the Mail app in the screenshot above. If you can live without the app then the best thing to do is delete the app.


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