Why Is My Phone Battery Draining So Fast? 12 Fixes That Work

You charged your phone to 100% this morning, and by lunch it is already begging for a charger. It is frustrating, and the cause is rarely obvious.

The good news is that most battery drain comes from a handful of settings and habits you can change in a few minutes. The less good news is that no setting can make an old, worn-out battery feel new again. This guide helps you tell the difference.

Below are 12 fixes, with the exact menu paths for iPhone and Android. Menu names can vary slightly between phone brands and software versions, so if a path does not match exactly, use the search bar at the top of your Settings app.

First, find out what is actually using your battery

Before you change anything, look at the numbers. Your phone already keeps a record of which apps use the most power.

1. Check battery usage by app.

• iPhone: Go to Settings > Battery. Scroll down to see usage by app for the last 24 hours or the last 10 days.
• Google Pixel: Go to Settings > Battery > Battery usage.
• Samsung Galaxy: Go to Settings > Battery > Battery usage (on some older models, Settings > Device care > Battery).

Look for anything surprising. If a game you barely opened sits at the top of the list, or an app shows lots of background activity, you have found a likely culprit. You can update it, restrict it or delete it.

Tame your screen

The display is usually the biggest single power user on any phone. Small changes here make a real difference.

2. Turn on automatic brightness and lower it a little.

• iPhone: Go to Settings > Accessibility > Display & Text Size and turn on Auto-Brightness. Then pull down Control Center and nudge the slider lower.
• Pixel: Go to Settings > Display (called Display & touch on some newer versions) and turn on Adaptive brightness.
• Samsung: Go to Settings > Display and turn on Adaptive brightness.

3. Shorten your screen timeout.

• iPhone: Settings > Display & Brightness > Auto-Lock. Try 30 seconds or 1 minute.
• Pixel: Settings > Display > Screen timeout.
• Samsung: Settings > Display > Screen timeout.

4. Consider dark mode and the always-on display.

On phones with OLED screens, which includes most recent iPhones and many Android phones, dark pixels use less power. Turn on dark mode in Settings > Display & Brightness (iPhone) or Settings > Display (Android).

If your phone has an always-on display, try switching it off for a day to see if it helps. On iPhone models that have it, go to Settings > Display & Brightness > Always On Display. On Samsung, go to Settings > Lock screen and AOD > Always On Display. On Pixel, look in Settings > Display > Lock screen for Always show time and info.

Stop apps working behind your back

Many apps refresh content and check your location even when you are not using them. Together, that adds up.

5. Limit background activity.

• iPhone: Go to Settings > General > Background App Refresh. Turn it off for apps that do not need to update in the background, such as games or shopping apps.
• Pixel: Go to Settings > Apps, pick an app, then tap App battery usage and choose Restricted or Optimized.
• Samsung: Go to Settings > Battery > Background usage limits and add rarely used apps to Sleeping apps or Deep sleeping apps.

Be careful with messaging and alarm apps. If you restrict them too much, you may miss messages or reminders.

6. Review location access.

GPS is a well-known battery drain, especially when several apps use it at once.

• iPhone: Settings > Privacy & Security > Location Services. Set most apps to While Using the App or Never, rather than Always.
• Android: Settings > Location > App location permissions. Change apps to Allow only while using the app where possible.

7. Cut down on notifications.

Every notification wakes the screen. Go to Settings > Notifications on iPhone or Android and switch off alerts from apps you never act on.

Use your phone's built-in power-saving modes

8. Turn on Low Power Mode or Battery Saver.

• iPhone: On recent iOS versions, go to Settings > Battery > Power Mode and turn on Low Power Mode. On older versions, it sits directly under Settings > Battery. You can also add it to Control Center.
• Pixel: Settings > Battery > Battery Saver. You can set it to turn on automatically at a certain percentage.
• Samsung: Settings > Battery > Power saving.

These modes reduce background activity and visual effects. Calls, texts and most apps still work normally.

On newer iPhones that support it, recent versions of iOS also offer Adaptive Power under Settings > Battery > Power Mode. It makes small performance adjustments when your usage is heavier than usual.

On Pixel phones, also look for Adaptive Battery in Settings > Battery. It learns which apps you use and limits the rest.

Keep your software up to date

9. Install system and app updates.

Updates often include battery fixes. Be aware that right after a big system update, your phone may drain faster for a day or two while it re-indexes photos and files in the background. That usually settles by itself.

• iPhone: Settings > General > Software Update.
• Pixel: Settings > System > Software updates.
• Samsung: Settings > Software update.

Update your apps through the App Store or Google Play as well.

Watch for weak signal and heat

10. Mind your signal and your temperature.

When your phone has poor cellular reception, it boosts its radio power to keep searching for a signal. If you are in a basement or an area with weak coverage, switching to Wi-Fi or turning on Airplane Mode for a while can save a lot of battery.

Heat is also hard on batteries. Apple and Google both advise avoiding extreme temperatures. Do not leave your phone on a car dashboard in summer, and take off a thick case if the phone gets hot while charging.

11. Trim mail fetching and widgets.

On iPhone, email accounts that constantly check for new mail use power. Go to Settings > Apps > Mail > Mail Accounts > Fetch New Data (on older iOS versions, Settings > Mail > Accounts) and choose a longer interval or Manually for accounts that are not urgent.

Widgets that refresh live data, such as weather or news, add a little drain too. Keep only the ones you use.

Check your battery's health

12. See whether the battery itself is worn out.

All lithium-ion batteries lose capacity over time. If your phone is a few years old, the battery may simply hold less charge than it used to, and no setting can reverse that.

• iPhone: Settings > Battery > Battery Health (on some models, Battery Health & Charging). Apple shows a maximum capacity percentage and a message if service is recommended.
• Pixel: On recent Android versions, go to Settings > Battery > Battery health. Some models show an estimated capacity.
• Samsung: Open the Samsung Members app, tap Support, then Phone diagnostics, and run Battery status.

If your battery is flagged as degraded, a battery replacement from the manufacturer or an authorized repair shop is often much cheaper than a new phone. Check the manufacturer's website for current service options and costs.

Quick comparison of all 12 fixes

Fix	iPhone	Android (Pixel / Samsung)	Typical effort
Check usage by app	Settings > Battery	Settings > Battery > Battery usage	1 minute
Auto-brightness	Accessibility > Display & Text Size	Settings > Display	1 minute
Shorter screen timeout	Display & Brightness > Auto-Lock	Settings > Display > Screen timeout	1 minute
Dark mode / always-on display	Display & Brightness	Display / Lock screen settings	2 minutes
Limit background activity	General > Background App Refresh	Per-app battery settings / Background usage limits	5 minutes
Location access	Privacy & Security > Location Services	Location > App location permissions	5 minutes
Fewer notifications	Settings > Notifications	Settings > Notifications	5 minutes
Power-saving mode	Battery > Power Mode	Battery Saver / Power saving	1 minute
Software updates	General > Software Update	System or Software update	Varies
Signal and heat	Airplane Mode, Wi-Fi	Airplane Mode, Wi-Fi	Habit
Mail fetch and widgets	Mail Accounts > Fetch New Data	Per-app sync settings	3 minutes
Battery health	Battery > Battery Health	Battery health / Samsung Members	1 minute

What will not help (and may hurt)

Skip "battery booster" and "phone cleaner" apps. They cannot do anything your phone does not already do, and some show aggressive ads or collect data.

Constantly swiping away all your open apps is another common myth. On modern phones, reopening an app from scratch can use more power than letting the system pause it. Only force-close an app if it is frozen or misbehaving.

FAQ

Is it bad to charge my phone overnight?

Modern phones manage charging to protect the battery. iPhones offer Optimized Battery Charging in Settings > Battery > Charging (or Battery Health & Charging on some versions), and many Android phones have similar options in their battery settings. These slow down charging near 100% to reduce wear.

Why does my battery drain faster after an update?

Right after a major update, your phone does extra background work, such as re-indexing photos and files. This often lasts a day or two. If heavy drain continues for more than a few days, check battery usage by app to find the cause.

Should I let my battery drop to 0% before charging?

No. Lithium-ion batteries do not need full discharge cycles. Charging little and often is fine, and frequently running it down to zero is not helpful.

When should I replace the battery?

If your phone shows a service warning, shuts down unexpectedly, or no longer lasts a normal day after you have tried these fixes, a replacement is worth considering. If the battery looks swollen or the phone gets unusually hot, stop using it and take it to a professional repair service right away.