Installing an iOS update first may seriously affect battery life. (applicable to iOS 1 1.3 update). The update of iOS 1 1.3 may cause the battery calibration settings of iPhone or iPad to be turned off. At this time, it may take several charging/charging cycles to solve this problem. In the meantime, the best thing you can do is to use the equipment normally and charge it when you need it.
Of course, after the update, you need to determine whether there is a battery problem. Settings > battery usage since the last full charge (scroll to the bottom of the page to find), including usage and standby.
The first thing I suggest you do is to check whether there is abnormal battery consumption.
Fully charged before going to bed (reset statistics), stop charging when sleeping, and wake up the next day to check the usage and standby information. Ideally, what you want to see is the standby number representing the length of sleep, and the usage chart representing the iPhone performing some background tasks during sleep. The smaller the dose number, the better. However, unless you have turned off background tasks and your iPhone has done nothing all night, it will not be zero. Don't worry about eight hours. It took about 15 minutes. If it is used for more than 30 minutes in eight hours, there may be a slight abnormal power consumption problem. More than an hour may be an abnormal problem with serious power consumption.
Another quick test to see if there may be a problem of battery exhaustion is to write down the use and standby numbers, then lock your mobile phone and keep it for five minutes. After five minutes, it's time to check the figures again. It is normal to increase the standby time by more than 4 minutes, but less than 4 minutes indicates that there may be battery loss problems. (The accuracy is not as good as the previous method, but the efficiency is more obvious.)
It is important to remember that these tests are only for finding abnormal power consumption, and can't help you find the battery itself or calibration problems.
If you have done the test, your iPhone has an abnormal battery consumption problem. What are you going to do next? Let's solve all kinds of problems that may lead to excessive power consumption.
Check whether your battery is aging.
This is how you find it. Use iOS 1 1.3 to check the health of the battery.
Go to settings > battery. There, you will see the new option label battery health (beta). Click here to learn about your battery.
Please note that this feature is only available for iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPhone SE, iPhone 7 and iPhone 7 Plus.
If the maximum capacity of your battery exceeds 80%, then there is no problem. If it is lower than 80%, you can consider replacing the battery with a new one. If it is close to 80%, such as 8 1%, your iPhone may turn off automatically when it is exposed to cold environment.
consistency operation
Settings > battery to view the battery usage list. Click anywhere in the list to change it from showing the percentage to showing the consumption of running programs.
Of course, there is also the problem of signal coverage. If this is the cause of power failure, in areas with poor signal coverage, try to put iPhone in flight mode, turn on Wi-Fi and Bluetooth independently, and then make power statistics.
If there are unexplained high-power applications in the statistics, you may have found the root of the problem.
In settings > general > background application refresh, disable background refresh for this application.
After this operation, check whether the abnormal power consumption problem is solved by repeating the previous test. If there is no improvement, look for another application in the background that may affect battery life. Of course, if there is no improvement after disabling, please undo the previous changes.
Push mail
Another culprit may be pushing e-mail, which will prevent the phone from entering the normal sleep state. If you find that the usage and standby times are almost the same when you test here, then this may be the problem.
Settings > mail > account > get new data, temporarily disable push, and see if it helps. If you have multiple email accounts, disable push one by one to see if it works. This problem is usually not caused by iCloud, but mainly by a third-party mail provider.
application program
Applications can indirectly affect battery life through pop-up notifications.
Disable notifications for applications that are used infrequently (Settings >; Notification), background refresh (settings > general > background application refresh) and location service (settings >; Privacy >; Location service) and other functions.
The above methods can help you solve most of the problems of abnormal power consumption at present. If it is not the above problem, then you can choose several ways:
Restore your iPhone and reinstall all the data in the backup (which may cause the problem to recur) or set it from scratch (which is time-consuming).
Take it to Apple for after-sales solution.
In addition, when you encounter battery problems, the power saving mode is your best friend. Simply click the button to significantly reduce battery consumption (click the button again to start the power saving mode). You can set the > battery discovery switch or turn it on from the control center.