Start with the per-app battery usage report (Solution 1): it separates the two possible scenarios in a minute. If one app shows heavy consumption, the problem is software and Solutions 2 to 5 will fix it. If consumption is spread across everything and the phone is more than two years old, it is physical battery wear - no setting brings back the original runtime, and replacement is the only real route.
What causes this problem
- A badly behaved app running in the background and keeping the processor awake.
- A bright screen with a long timeout - the display is usually the single largest consumer.
- Location, Bluetooth and sync left on permanently for apps that do not need them.
- Weak mobile signal: with poor coverage, the phone raises radio power and consumes far more.
- Natural battery wear, losing capacity with every charge cycle over the years.
- A recent system or app update that changed background behaviour.
- Note how long you have had the device. Beyond two years of daily use, part of the drop is normal wear with no software fix.
- Notice whether the drop was sudden or gradual: sudden points to an app or an update; gradual points to wear.
- Check whether the phone gets warm even sitting in your pocket - that indicates a background process running.
- Charge to 100% before starting, so the usage reports have a full cycle to measure.
Solutions, in the order to try them
1Find out what is consuming the battery
This step saves you all the rest. Android records consumption per app, and the culprit usually stands out immediately - sometimes an app you had forgotten was installed.
- Open Settings > Battery > Battery usage (on some phones, Usage details).
- Look at the list sorted by consumption since the last full charge.
- The screen usually leads, and that is normal. What matters is an ordinary app showing above 10%.
- If a suspicious app appears, check when you actually used it - high consumption with no use is the clear sign of the problem.
2Restrict the app consuming in the background
Once you have the culprit, you do not need to uninstall it: you can stop it working while it is not open.
- Open Settings > Apps and select the app in question.
- Tap Battery (or Battery usage) and choose Restricted, or Optimised if you need its notifications.
- Under Mobile data and Wi-Fi, turn off Background data use for apps that do not need to refresh on their own.
- Note: restricting messaging apps delays their notifications. Use Optimised for those.
3Adjust the screen, the biggest consumer
In almost every report, the display is the largest single item - and it is also where a change gives the most immediate result.
- Turn on Adaptive brightness in Settings > Display and avoid leaving brightness at maximum manually.
- Reduce Screen timeout to 30 seconds or 1 minute.
- If your phone has an OLED or AMOLED screen, enable Dark theme: black pixels stay switched off and genuinely save power.
- Turn off the always-on display if you do not use it.
4Review location and sync permissions
Location is the second largest invisible consumer. Many apps request continuous access without needing it to work.
- Open Settings > Location > App location permissions.
- Change everything that is not navigation or maps to Allow only while using the app.
- Under Settings > Accounts, turn off auto-sync for accounts you do not use.
- Switch off Bluetooth and Wi-Fi when you will be out of range for hours - scanning for networks costs power.
5Rule out a problematic update
If the drop started from one day to the next with no change in habits, a recent update is usually the cause.
- Check under Settings > System > System update whether anything installed in the last few days.
- In the Play Store, under Manage apps and device, see which apps updated recently.
- If you identify the app, uninstall its updates or reinstall it.
- Restart the phone: processes stuck after an update are a common cause and clear on reboot.
6Assess whether the battery is worn out
If consumption is spread across everything with no clear culprit, and the device is a few years old, the battery has lost capacity. That is physical and no setting reverses it.
- Signs of wear: the phone shuts down at 20% or 30%, charges very quickly to 100% and drops fast afterwards.
- A swollen battery - the back cover or screen lifting - needs immediate replacement and is a safety risk. Stop using it.
- Some manufacturers show battery health in the phone's own diagnostics menu.
- A battery with two to three years of daily use is typically at 70% to 80% of its original capacity.
Applies to
| System | Status |
|---|---|
| Android 12 to 15 | Confirmed |
| Android 9 to 11 | Confirmed |
| Samsung and Xiaomi | They add their own menus (Battery care, Power saving) with the same options |
Menu names can change slightly between versions. If a step above does not match what you see on screen, the official support page from the manufacturer has the most current wording for your version.
Frequently asked questions
Last checked: Aug 19, 2026 · We review this guide whenever the manufacturer changes the process.