First steps in improving your battery:
Using Batteries – Starting with iOS 9 and above, iOS includes an option that shows you which applications spend as much battery. You can find the option under “Battery” in the Battery Usage section.
Using the battery
Here you can see which applications are using the most batteries in the past 24 hours and 7 days. If you touch a small clock icon on the side, you’ll get information on how the apps are using the battery, how long they are used on the screen while using the device, and how much in the background while you’re not using it. Back-up is what you need to pay attention to, which we will further explain in the text below. (See Updating the Wallpaper Application)
This is your first, but not the only, step in finding the reason for the higher battery consumption. As you can see from my example, though the iPhone is optimized for best spend, some applications like Overcast and Photo use a lot of battery backlight. The question is why and what can be done on this issue.
If you notice that your battery suddenly shorter, this is the first place you need to check.
Low Power Mode – Starting with iOS 9 and above, iOS has a so-called Mod Power Supply. This mode of operation automatically burns when your battery drops below 20%, and it automatically goes off when you charge more than 80 percent of the battery. You may notice that the battery icon is yellow when the iPhone is in low power mode.
See the photo for low-power mode in the featured image.
Low power mode helps you to conserve battery power by automatically shutting off some of the less important services and slowing down the work of the phone’s processor itself. When this option is turned on, retrieving email messages, Hey Siri, refreshing apps in the background, automatic downloads, and some visual effects will be reduced or disabled.
This is how Apple thinks about battery consumption. What’s more, if you already know that you will not be near the charger and that you will need more battery than usual, you can activate this option without waiting for the battery to drop below 20%. Go to Settings, Battery, and disable the Low Power Mode. This will surely add an extra hour or two to battery life if you turn it on when your battery is at hundred percent.