iPhone Battery Draining Fast After an iOS Update? How to Fix It

An iPhone battery draining fast after update day is normal at first, so give it a day or two before you change anything. After a big iOS release the phone does a lot of catch-up work in the background, and Apple says outright that a temporary hit to battery life and heat is normal. If the drain is still there after that, it’s usually one app or setting, and the Battery screen will tell you which.

Why the battery drains after an iOS update

Apple’s support note on updates explains that the device needs to finish setting itself up in the background after installing a new version. That covers:

• Indexing your data and files for Spotlight and on-device search, including Photos analysis that recognises people, objects and text.
• Downloading new assets, such as on-device models for Apple Intelligence features, keyboard dictionaries and wallpapers.
• Updating apps that have shipped new versions for the release.

Most of that work is scheduled for when the phone is charging, locked and on Wi-Fi. So the fastest way through it is to leave the iPhone plugged in overnight on Wi-Fi for a night or two. If it feels warm and the percentage drops quickly during that window, that’s expected. Apple also notes new features can need a little extra power at first, which later point releases usually tune.

1. Check battery usage by app

Once the first couple of days have passed, open Settings > Battery. The chart shows your battery level and activity, and the list underneath breaks usage down by app. Switch between the last 24 hours and the last 10 days to separate a one-off spike from a real pattern.

Look for anything with a lot of background activity compared with time on screen. A social or streaming app eating 20% of your battery while you barely opened it is your culprit. Update it from the App Store, force-quit it, or delete and reinstall it. If the Battery screen shows an Insight about an app or setting, tap it, because those suggestions are generated from your actual usage.

2. Rein in Background App Refresh

Updates sometimes switch features back on, and new app versions ask for more background time. Go to Settings > General > Background App Refresh and turn it off for apps that don’t need fresh content the moment you open them. You can also set it to Wi-Fi only, which saves a lot of battery on a weak mobile signal. Messaging, email and navigation apps are worth leaving on. Most games and shopping apps aren’t.

3. Audit Location Services

GPS is one of the biggest battery draws on any phone. Open Settings > Privacy & Security > Location Services and go through the list:

• Change apps set to Always to While Using the App unless they genuinely need it, such as a fitness tracker.
• Turn off Precise Location for apps that only need a rough area, like weather.
• Scroll to the bottom and open System Services. You can safely turn off several of the location-based suggestions and analytics items without breaking anything you rely on.

4. Trim widgets and Live Activities

Every widget on your Home Screen and Lock Screen refreshes on a schedule, and Live Activities (sports scores, delivery trackers, ride status) keep updating the Lock Screen and Dynamic Island while they run. Remove widgets you never look at, and turn off Live Activities for chatty apps under Settings > [app name] > Live Activities. End an active one by swiping it away on the Lock Screen.

5. Check display and brightness

The screen is usually the single biggest power consumer, so a few settings make a noticeable difference:

• Make sure Auto-Brightness is on in Settings > Accessibility > Display & Text Size. Updates rarely change it, but it’s worth confirming.
• On iPhones with an always-on display, turn off Always On Display in Settings > Display & Brightness if you don’t need it.
• Use Dark appearance. On an OLED iPhone, black pixels use far less power.
• Shorten Auto-Lock in Settings > Display & Brightness so the screen isn’t left on.

While you’re in Settings > Battery, Low Power Mode is the quick fix for getting through the day. On iPhones that support Apple Intelligence, iOS 26 also added Adaptive Power under Settings > Battery > Power Mode, which makes small performance trade-offs automatically when it predicts you’ll use more battery than usual.

6. Check battery health

Sometimes the update is a coincidence and the battery is simply old. Go to Settings > Battery > Battery Health (called Battery Health & Charging on older models) and look at Maximum Capacity. Apple designs iPhone batteries to keep around 80% of their original capacity over their rated cycles, and below that iOS will show a service message. A newly calculated capacity figure can also nudge down slightly after an update. If yours is low, a replacement will do more than any setting. I wrote up a DIY iPhone battery replacement a while back, but an Apple or authorised repair is the safer route for most people.

7. When to reset settings or contact Apple

If drain is still bad a week after updating, with no obvious app in the Battery list and healthy capacity, try these in order:

1. Restart the iPhone. It clears any background process that’s stuck in a loop.
2. Install the next point release in Settings > General > Software Update. Apple regularly fixes battery bugs in x.0.1 and x.1 updates. If the update itself won’t install, see iPhone Unable to Verify Update on iOS 27.
3. Reset All Settings under Settings > General > Transfer or Reset iPhone > Reset. This returns settings such as network, keyboard, location and privacy to their defaults without deleting your apps, photos or data.
4. Contact Apple Support through the Support app or support.apple.com. They can run remote diagnostics on the battery and tell you whether it’s hardware.

Got the same problem on your laptop? The Mac equivalent is here: Mac Battery Draining Fast After an Update? How to Fix It.