To make your phone battery last longer, lower the screen brightness and timeout, find and restrict the apps that drain the most power, turn on Low Power Mode or Battery Saver when you need it, and keep the phone away from heat. To keep the battery healthy for years, avoid leaving it at 100% for long periods: use Charge Limit or Optimized Battery Charging on iPhone, and Adaptive Battery and charging protection on Android. This guide covers quick fixes for today and habits that slow battery aging.
Two different goals: today’s charge vs battery health
| Goal | What helps |
|---|---|
| Make one charge last all day | Screen settings, restricting background apps, power-saving modes, weaker signals |
| Keep the battery healthy for years | Avoiding heat, not sitting at 100% for hours, using charge limits |
All phone batteries wear out slowly with use. If yours drains much faster than it used to, check its health first (see the last section).
Step 1: Find the apps draining your battery
- iPhone: Settings > Battery shows battery use by app for the last 24 hours and 10 days.
- Android: Settings > Battery > Battery usage (names vary by phone).
Look for apps using a lot of power in the background, such as social media, games, navigation and shopping apps. Close and update them, or uninstall the ones you rarely use.
Step 2: Limit what runs in the background
- iPhone: Settings > General > Background App Refresh. Turn it off for apps that do not need fresh content when closed.
- Android (Pixel): turn on Adaptive Battery in Settings > Battery > Battery Saver > Adaptive Battery. It limits apps you do not use often. For a specific app, open Settings > Apps, tap the app, then App battery usage, and choose Optimized.
- Location: set apps to use your location only “While Using the App” instead of “Always”.
- Notifications: turn off notifications for apps you do not need to hear from; each one wakes the screen.
Before installing new apps, check what they ask for; see how to check an app’s privacy before installing it.
Step 3: Adjust the screen
The screen is usually the biggest power user.
- Turn on auto-brightness and lower the brightness a little indoors.
- Set the screen timeout (Auto-Lock on iPhone) to 30 seconds or 1 minute.
- Use dark mode; on phones with OLED screens, dark pixels use less power.
- Turn off the always-on display if your phone has one and you do not need it.
Step 4: Use power-saving modes
- iPhone: turn on Low Power Mode in Settings > Battery or from Control Center. It reduces background activity and some visual effects.
- Android: turn on Battery Saver in Settings > Battery. Many phones also have an extreme mode that limits the phone to essential apps.
Most phones can turn these on automatically at a certain battery level.
Step 5: Watch your connections
- A weak cellular signal makes the phone work harder. In buildings with poor reception, connect to Wi-Fi.
- Turn off Bluetooth, Wi-Fi scanning and hotspot when you are not using them.
- On long flights or in areas without signal, use Airplane Mode.
Connecting to a guest’s Wi-Fi is easier with a QR code; see how to make a QR code for Wi-Fi.
Step 6: Protect long-term battery health
iPhone
According to Apple, iPhone 15 models and later have a Charge Limit in Settings > Battery > Charging, which you can set from 80% to 100%. The phone stops charging near the limit, and charges to 100% occasionally to keep its battery estimate accurate. When the limit is 100%, Optimized Battery Charging learns your routine and waits to finish charging past 80% until shortly before you usually unplug. On iPhone 14 and earlier, Optimized Battery Charging is in Settings > Battery > Battery Health & Charging.
Android
Many Android phones offer a similar feature, such as adaptive charging on Pixel or a battery protection option on Samsung Galaxy phones, often found under Settings > Battery. Turn it on if you charge overnight.
For every phone
- Avoid heat: do not leave your phone in a hot car or direct sun, and remove thick cases if it gets hot while charging.
- Use good chargers: the original charger or a certified one from a trusted brand.
- Do not obsess over percentages: modern phones manage charging well. Occasional full charges and overnight charging with optimization turned on are fine.
How do you check your battery health?
- iPhone: Settings > Battery > Battery Health (Battery Health & Charging on older models) shows the maximum capacity compared with when it was new.
- Android: many recent Pixel and Samsung phones show battery health in Settings > Battery or in a diagnostics app. Options vary by model.
If capacity has dropped a lot and the phone shuts down unexpectedly, a battery replacement from the manufacturer or an authorized shop can make an older phone feel new. Laptops age the same way; see how to check laptop battery health.
Apps with location set to “Always” drain your battery. Learn how to check and change app permissions.
If your battery is beyond saving and you upgrade, read how to transfer data to a new phone so nothing gets lost.
Frequently asked questions
Is it bad to charge my phone overnight?
Not if optimized charging or a charge limit is on. These features keep the battery from sitting at 100% for hours.
Should I close all my apps to save battery?
Usually no. Both iOS and Android manage paused apps well, and reopening them from scratch can use more power. Restrict background activity for the few apps that drain the most instead.
Does dark mode really save battery?
On phones with OLED screens, yes, especially at higher brightness. On LCD screens, the difference is small.
Do AI features drain the battery?
Heavy use of AI assistants, voice and camera features does use extra power. See which apps are worth it in our list of the best AI apps for iPhone and Android.
Start with three changes
Check which apps drain your battery, shorten the screen timeout and turn on optimized charging or a charge limit. These take five minutes and make a noticeable difference both today and over the life of your phone.
Sources
- Apple Support: About Charge Limit and Optimized Battery Charging on iPhone
- Google Pixel Help: Fix battery drain and Adaptive Battery
This article is based on the official documentation and reporting listed in the sources above, checked on October 19, 2026. Features and prices change, so confirm details on the official pages before you buy. ShokokoTech does not accept payment for coverage. Read our editorial policy.
