Android Battery Draining Fast? Find the Cause and Fix It

If your Android battery is draining fast, open Settings > Battery > Battery usage first and look for one app or system item using far more than the rest, then restrict or remove it. If nothing stands out, the usual causes are a recent update (Google says extra drain for a few days afterward is normal), screen settings like Always-on Display, heat, a charge limit you forgot you turned on, or a worn battery, which Pixel 8a and later and Samsung Galaxy phones can check for you.

Also in this topic: Android Guides hub.

Jump to: which kind of drain? · find the cause · overnight test · after an update · restrict the app · power-hungry settings · 80% charge limit · heat · worn battery · last steps · FAQ

How we put this together: Every menu path, number, and threshold below comes from Google's Pixel and Android help pages and Samsung's US support site, linked in place and checked on October 21, 2026. We didn't run battery tests on every phone for this guide, so treat the menu names as Google's and Samsung's current wording; older Android versions and carrier models can label things a little differently.

Is It Sudden Drain, Overnight Drain, or an Aging Battery?

Figure out which kind of drain you have before you change anything, because each one has a different fix. Drain that started on a specific day points to an app or update. Drain while the phone sits untouched points to background activity. A battery that has slowly gotten worse over a year or two is probably just worn.

What you notice	Most likely cause	Start here
Drain started right after a system update	The phone is still re-optimizing	Wait a few days, then check usage
Drain started after installing an app	That app running in the background	Restrict or uninstall it
Loses more than 10% overnight while idle	Background app or a system component	Google's overnight test
Dies fast during the day with the screen on	Brightness, Always-on Display, high refresh rate	Screen settings
Never seems to get past 80% when charging	A charge limit is on	Charging optimization or Battery protection
Drains fast and gets warm	Heat, gaming, weak signal, or charging	Cool it down
Slowly worse over months, or shuts off unexpectedly	Worn battery	Check battery health

How to See What's Draining Your Android Battery

Your phone already tracks which apps and parts of the system use the most battery, so check that list before you guess. On a Pixel or most stock-Android phones, open Settings > Battery > Battery usage. Tap View by apps to see apps, or View by systems to see items like Screen, Mobile network, Wi-Fi, and Android OS, according to Google's battery drain help page.

On a Samsung Galaxy phone, open Settings > Battery and tap View details. Samsung says this shows per-app usage plus your Screen on time and Screen off time, per its Galaxy battery support page. A big screen-off number is the clue that something is working while the phone sits in your pocket.

Use the built-in diagnostics

• Pixel 6 and later: Settings > Battery > Battery diagnostics > Battery draining too quickly. It suggests settings to change and apps to review.
• Samsung Galaxy (Android 12 or later): Settings > Device care > Diagnostics > Phone diagnostics, or the Samsung Members app. Samsung's diagnostics page lists Battery status among the tests.

Run Google's Overnight Battery Test

Google's own yardstick is simple: a healthy phone should lose less than 10% overnight while idle. On its Pixel battery troubleshooting page, Google tells you to charge to 100%, close your apps, unplug, and leave the phone alone overnight. If it drops 10% or less, the battery is working as expected. If it drops more, check Battery usage the next morning.

Google gets specific about what to do with the result. If a system item such as Android OS, Screen, CPU, Wi-Fi, or Mobile network used more than 10%, it says to contact Pixel Support. If a third-party app like Netflix or Instagram is the culprit, clear that app's cache or storage and repeat the test. For Google apps from the Play Store, such as Chrome or YouTube, Google suggests Uninstall updates from the app's info page and testing again.

The test works on any Android phone, not just Pixels, because it only needs the Battery usage screen. Most "battery draining fast" guides skip this step, but it's the quickest way to tell a real problem from normal use.

Did the Drain Start After an Update or a New Phone?

Some extra drain right after an update is expected, so give it a few days before you start changing things. Google says it's normal for a Pixel to drain a little more after a software update because the phone is working to optimize the new software, and that after setting up a new phone or a factory reset, battery optimization can take a few weeks to take full effect.

That matters when you're deciding whether to reset your phone. A factory reset starts that learning period over, so don't treat it as a quick fix. If drain stays high for more than a few days after an update, check Battery usage and search for your model and build. In 2026, for example, Pixel owners spent months on an idle-drain bug that ignored Airplane Mode. Our report on Google marking the Pixel idle battery drain bug fixed covers what happened.

Restrict or Remove the App That's Draining It

Once you know which app is to blame, limit what it can do in the background, and remove it if that doesn't help. You don't need to close every app you've opened. Google's Pixel help targets the specific apps with high usage rather than clearing everything.

On a Pixel or stock Android

1. Open Settings > Battery > Battery usage and tap the app.
2. Tap Allow background usage. Google recommends keeping Optimized selected for all apps, so switch the app back to it if it's set to Unrestricted. If it still drains, turn Allow background usage off for that app.
3. If it's still misbehaving, go to Settings > Apps > See all apps, tap the app, and choose Force stop.
4. If the drain comes back, uninstall it.

One exception: you can't force stop or uninstall Google Play services. Google says Android depends on it. If it shows up near the top of the list, restart the phone and check for system and Play services updates instead.

On a Samsung Galaxy

Open Settings > Battery > Background usage limits. Samsung gives you three tools there:

• Put unused apps to sleep automatically sleeps apps you haven't opened in a while.
• Sleeping apps lists apps that are asleep. Samsung says they can run in the background again once you start using them.
• Deep sleeping apps never run in the background and only work when you open them.

Put the draining app in Deep sleeping apps, but leave out anything you need alerts from, like messaging, email, or banking. An app that never runs in the background can't reliably alert you. If that has already happened, our guide to fixing Android notifications that aren't working shows how to undo it.

Which Settings Drain the Most Battery?

The screen is usually the biggest single drain, so start there and then turn off background features you don't use. These are the settings Google and Samsung name in their own help pages.

Pixel

• Always-on Display: Settings > Display & touch > turn off Always-on Display.
• Smooth Display (Pixel 4 and later): Settings > Display & touch > Smooth Display > off. This keeps the screen from running at its higher refresh rate.
• Dark theme, Adaptive brightness, and a shorter Screen timeout, all under Display & touch. Turn off live wallpapers too.
• Adaptive connectivity (Pixel 4a 5G and later): Settings > Network & internet. Google notes some US carriers may limit it.
• Now Playing, which listens for songs around you, can be turned off to save power.
• Hotspot, Wi-Fi auto-on, and extra accounts: Google suggests turning off tethering when you're not using it, stopping Wi-Fi from turning on automatically near saved networks, and deleting accounts you don't use.

The full list is on Google's Pixel battery life page. If you own a Pixel 10 Pro, our Pixel 10 Pro battery drain fixes rank these settings for that phone.

Samsung Galaxy

• Screen timeout: Settings > Display > Screen timeout. Samsung's default is 30 seconds, and it says 15 seconds saves the most.
• Accidental touch protection: Settings > Display. Samsung says it reduces drain from the screen waking in a pocket or bag.
• Light performance profile: Settings > Device care > Performance profile > Light. It favors battery life over speed and doesn't affect games, which use Game Booster's settings.
• Power saving: Settings > Battery > Power saving. Samsung warns that background apps may not update or send notifications while it's on.

A correction for older guides: many battery tips still tell Samsung owners to turn on Wi-Fi power saving mode under Intelligent Wi-Fi. Samsung's own page now says that option isn't available on the Galaxy S25 or any Galaxy phone running One UI 7.0 or later, so don't spend time looking for it on a current phone.

Is Your Phone Only Charging to 80%?

If your battery seems to run out quickly but the drain rate looks normal, check whether it's actually reaching 100%. Both Pixel and Samsung phones have charge limits that protect the battery, and it's easy to forget you turned one on.

• Pixel: Settings > Battery > Battery health > Charging optimization. Limit to 80% stops charging at 80%. Adaptive Charging still reaches 100%, but finishes just before you usually unplug. Google also says a Pixel with the 80% limit needs a full charge every 10th cycle to keep its capacity readings accurate. Leave it plugged in for at least 30 minutes after it shows 100%.
• Samsung: Settings > Battery > Battery protection. Basic stops at 100% and resumes at 95%. Maximum stops at a level you set. Adaptive holds at 80% overnight and switches to Basic before you wake up.

Keep the limit on if you usually end the day with charge to spare, and turn it off for long days. If the phone won't charge at all, that's a different problem. See our guide to fixing an Android phone that's not charging.

Heat Makes Your Battery Drain Faster

A hot phone loses charge faster even when you're not using it, and Google says that kind of drain can damage the battery. Its advice is to avoid letting the phone overheat, especially when it's fully charged, and not to keep it plugged in longer than needed.

Google's Pixel battery page gives concrete numbers: charge in a cool place at about 78°F (25°C), and avoid six or more hours in temperatures above 95°F (35°C), which is easy to hit in a parked car in a US summer. If your phone is warm while it drains, follow our steps for an Android phone that's overheating first.

How to Tell if Your Android Battery Is Worn Out

Every lithium-ion battery loses capacity as it ages, and below about 80% of its original capacity, both Google and Samsung suggest a replacement. Here's how to check.

Pixel

On a Pixel 8a or later, open Settings > Battery > Battery health. It shows Normal or Reduced, and Reduced means capacity is below 80%. Tap Battery capacity for the estimated percentage. Your cycle count is under Settings > About phone > Battery information. The Pixel 6a, 7, 7 Pro, 7a, 8, and 8 Pro don't show a health status.

Google rates the Pixel 3 through Pixel 8 Pro and Pixel Fold for about 800 charge cycles before replacement is recommended, and the Pixel 8a and later for about 1,000. One cycle is a full 100% of use, so going from 100% to 50% and recharging counts as half a cycle.

Battery health assistance shortens runtime on purpose. On the Pixel 6a and later, Google lowers the battery's maximum voltage in stages, starting at 200 charge cycles and continuing until 1,000, and says you "may notice small decreases in your battery's runtime." So an older Pixel that lasts a bit less each month may be working as designed. On the Pixel 6a through Pixel 9 Pro Fold you can turn it off at Settings > Battery > Battery health > Battery health assistance, though Google recommends leaving it on. On the Pixel 9a and later, it can't be turned off.

Samsung Galaxy

Open the Samsung Members app, tap Support, then Get Started. Stop the full scan and tap Battery status. Samsung rates the result Normal, Weak (efficiency has dropped), or Bad (significantly degraded). Samsung's battery replacement page lists fast drain after charging and sudden shutdowns, especially in cold weather, as signs of an aging battery. Your phone may also show a battery performance degradation alert, and if it does, Samsung says to take it to a service center.

If the back or screen is bulging, stop using the phone. Google's page on swollen batteries says not to press the battery back in, pry the phone open, or throw it in household trash. Contact the manufacturer for repair or recycling instead.

Still Draining? Restart, Update, Then Get Support

If nothing above helped, work through these in order, from least to most disruptive:

1. Restart the phone. On a Pixel 6 or later, hold Power and Volume up, then tap Restart.
2. Update everything. On Samsung, go to Settings > Software update. Then update apps in the Play Store under your profile picture > Manage apps & device. Samsung notes you may need to repeat the system update check more than once.
3. Get support. On a Pixel 9 or later, Settings > Device health & support has an "Ask Pixel Help" field. Samsung offers chat support through Samsung Members.
4. Factory reset, as a last resort. Google lists it as an advanced step that removes all your data, so back up first and remember the battery will need time to re-learn afterward.

FAQ

Why is my Android battery suddenly draining so fast?

Usually because of a recent update, a new or updated app, or heat. Google says a little extra drain after an update is normal for a few days. If it lasts longer, open Settings > Battery > Battery usage, find the app or system item at the top, and restrict it.

How much battery should an Android phone lose overnight?

Less than 10%, by Google's standard. Its Pixel overnight test says a phone that loses 10% or less while idle overnight is working as expected. Anything more means an app or system component is worth investigating in Battery usage.

Does closing apps save battery on Android?

Opinions differ. Google's Pixel help focuses on restricting or force-stopping the specific apps that show high usage rather than closing everything, and Android Police argues that reopening a closed app can cost more power than resuming it. Verizon's support page, on the other hand, still suggests closing unused apps and restarting about every 48 hours.

Does Dark mode save battery on Android?

Google lists Dark theme among the settings that use less battery on Pixel phones, along with lower brightness, a shorter screen timeout, and turning off Always-on Display. It also turns on automatically when you use Battery Saver.

When should I replace my phone's battery?

When capacity falls below 80% or the battery shows Reduced (Pixel) or Weak or Bad (Samsung Members). Google also recommends replacing it at about 800 cycles for the Pixel 3 through 8 Pro and about 1,000 cycles for the Pixel 8a and later.