Use a black background if you have an AMOLED screen. It will use less power because AMOLED screens only light the pixels needed for an image—if an image is completely black, all the pixels are off. When not in use, the screen is likely set to turn off after a certain amount of time. You can decrease the amount of time your smartphone’s screen stays illuminated by visiting How to Adjust the Screen Timeout on an Android Phone or How to Change Auto Lock Time on an iPhone. If you’re using an iPhone, disable the Raise to Wake feature so your screen doesn’t come on automatically when you lift it. You’ll find this setting in Settings > Display & Brightness.
To disable Bluetooth or Wi-Fi, swipe down from the top of the home screen (Android) or open the Control Center (iPhone) and tap the Bluetooth (a sideways bowtie) or Wi-Fi (three curved lines in the shape of a pie slice). See How to Turn Off Location Services to learn how to disable your phone’s GPS. If you’re using a non-smartphone, you can usually find the options to disable these services in your settings.
To turn on airplane mode, swipe down from the top of the home screen (Android) or open the Control Center (iPhone) and tap the airplane.
Nickel Metal Hydride (NiMH) batteries (common in non-smartphones) naturally get quite warm while charging unless you use a specialized “slow charger. " If your phone uses a NiMH battery, do not worry about the heat generated during charging unless it becomes so hot that it is uncomfortable to touch. When using a car charger, do not charge the battery when the inside temperature of your car is hot. Wait until the car has cooled before you plug in the phone.
Use this method to find out which apps are using the bulk of your Android’s battery power. Once you know what apps consume the most power, you can make an effort to open those apps less (or uninstall them completely). Because all Android models are different, you may see slightly different menu names than what you see here.
Tap an app to see specific information about how the app uses the battery. Depending on the app, you may see the option to enable Background restriction, which ensures the app doesn’t use the battery unless it’s open on the screen. If you’d like to see which Android services (in addition to apps), tap the three-dot menu again and select Show full device usage.
Use this method to find out which apps are using the bulk of your iPhone’s battery power. Once you know what apps consume the most power, you can make an effort to open those apps less (or uninstall them completely). You can also use this method to check the general health of your iPhone’s battery (iPhone 6/SE and later).
Tap the SHOW ACTIVITY link above the percentage column to show the amount of time the app was using the battery over the selected time period. Each entry will display how of that usage occurred with the screen on versus off (in the background).
Check “Maximum Capacity” to find out how much life is left in your iPhone’s battery. This value should be at 100% when the iPhone is brand new, but it will decrease over time. As the maximum capacity decreases, you’ll have to charge your iPhone more often. Once the battery’s capacity is problematically low, you’ll see a warning on the screen that tells you to replace the battery. [5] X Research source Check “Peak Performance Capability” to find out if your iPhone is functioning with reduced performance due to the maximum capacity being too low. Once the battery reaches the end of its life cycle, your iPhone will automatically stop performing as fast to preserve its life for as long as possible.
Use this method if you need to buy some extra battery time before you can access a phone charger.
Vibration and haptic feedback will be disabled. Location services and other apps and services that run in the background will be paused. Apps that sync in the background, such as your email and social media apps, will not update until you open the apps. Processing power will be reduced during power saving mode, so your Android may seem slower than usual.
Use this method if you need to buy some extra battery time before you can access an iPhone charger. While you’re in Low Power Mode, the battery indicator at the top of the screen will turn yellow.
The Auto-Lock feature will reduce to 30 seconds. Apps that refresh/sync in the background, such as your email and social media apps, will not fetch new content until you open the app. Some visual animations will be disabled. “Hey Siri” will not work.
Open Settings. Scroll down and tap Control Center (in the third group of settings). Tap Customize Controls. Scroll down and tap the + next to Low Power Mode. Now when you open the Control Center, you’ll see a battery icon on the bottom row that, when tapped, allows you to toggle Low Power Mode on or off.
