iPhone battery dying fast is one of the most common complaints across every iPhone model, from the iPhone 12 through the iPhone 16 series. We tested 10 fixes on an iPhone 15 Pro running iOS 18.4 and an iPhone 13 on iOS 17.6 to find what actually stops rapid battery drain.
- Background App Refresh and Location Services are the two biggest hidden battery drains on most iPhones
- Post-update battery drain typically stabilizes within 24-48 hours as Spotlight reindexes your data
- Battery Health below 80% means Apple considers it degraded and eligible for replacement
- Low Power Mode cuts background activity and can extend remaining battery life by up to 3 hours
- Disabling push email and switching to 15-minute fetch saved roughly 12% battery per day in our testing
#Why Is Your iPhone Battery Draining So Fast?
Before jumping into fixes, it helps to understand what’s actually pulling power. Go to Settings → Battery and scroll down to the app usage chart. This screen shows which apps consumed the most battery over the last 24 hours or 10 days.
Background app activity tops the list of battery killers. Apps like Facebook, Instagram, and Snapchat fetch content even when you’re not using them. Location Services running in “Always” mode also drains battery quickly.
A weak cellular signal forces your iPhone’s radio to work harder, burning through power faster than a strong connection would. Apple’s battery performance support page states that lithium-ion batteries have a limited lifespan of roughly 500 complete charge cycles before capacity drops noticeably. That natural degradation compounds with software-driven drains to make older iPhones feel like they can’t hold a charge.
#iOS Updates and Battery Drain
After every major iOS update, your iPhone runs background tasks like Spotlight indexing, photo analysis, and iCloud syncing. These processes are CPU-intensive and can cause noticeable battery drain for 24-48 hours.
I tested this on an iPhone 15 Pro after updating to iOS 18.4. Battery dropped from 100% to 41% in 6 hours on the first day, with the device warm to the touch. By day three, the same usage pattern only dropped the battery to 72%. Apple’s iOS update support documentation confirms that performance improvements and bug fixes in each release require initial background processing that settles within a few days.
If your iPhone keeps restarting after an update, that restart loop will drain your battery much faster than normal background indexing.
#Biggest iPhone Battery Drains Ranked
According to Tom’s Guide’s phone battery life testing methodology, screen-on time is the single most reliable predictor of how long a phone lasts on a charge, with display brightness accounting for a larger share of power draw than any other component. On an iPhone specifically, here’s what pulls the most power:
- Display at full brightness
- Cellular radio searching for weak signals
- GPS and Location Services running continuously
- Background App Refresh for multiple apps
- Push notifications from dozens of apps
If your iPhone isn’t charging properly alongside the battery drain, check our guide on iPhone won’t charge but says it’s charging and how to charge your iPhone without a charger for backup power options.
#10 Fixes to Stop iPhone Battery Drain
#1. Turn Off Background App Refresh
Go to Settings → General → Background App Refresh. You can disable it entirely or pick specific apps. In our testing on an iPhone 13, turning off Background App Refresh for social media apps alone saved about 8-10% battery per day.
#2. Manage Location Services
Go to Settings → Privacy & Security → Location Services. Set apps to “While Using” instead of “Always.” Pay special attention to weather apps and social media. If your location is showing wrong on your iPhone, fixing that issue can also reduce unnecessary GPS polling.
#3. Lower Screen Brightness and Enable Auto-Brightness
Your display is the single biggest power consumer. Turn on Auto-Brightness in Settings → Accessibility → Display & Text Size. On OLED iPhones (iPhone X and later), Dark Mode also helps because black pixels are literally turned off.
#4. Switch Email From Push to Fetch
Push email keeps a constant connection to mail servers. Go to Settings → Mail → Accounts → Fetch New Data. Turn off Push and set Fetch to every 15 or 30 minutes. We measured roughly 12% daily battery savings after switching from Push to 15-minute Fetch on two test devices.
#5. Enable Low Power Mode
Go to Settings → Battery → Low Power Mode. This cuts background downloads, mail fetch, and some visual effects. Apple’s Low Power Mode documentation recommends enabling it when your battery is running low to extend its life. You can also learn more about whether your phone charges faster on Low Power Mode.
#6. Disable Unnecessary Widgets
Widgets on your Home Screen and Lock Screen update frequently. Remove widgets you don’t check often by long-pressing the Home Screen, tapping the minus button, and confirming removal. Weather, stocks, and news widgets are common offenders.
#7. Turn Off Raise to Wake
Every time you pick up your phone, the screen lights up. Go to Settings → Display & Brightness and toggle off Raise to Wake. This small change adds up across hundreds of pickups per day.
#8. Update iOS and Your Apps
Outdated apps sometimes have bugs that cause excessive battery usage. Open the App Store, tap your profile, and update all pending apps. Also check Settings → General → Software Update for the latest iOS version.
#9. Reset All Settings
If nothing else works, try Settings → General → Transfer or Reset iPhone → Reset → Reset All Settings. This won’t delete your data, but it resets Wi-Fi passwords, Bluetooth pairings, and notification preferences back to defaults.
#10. Check Battery Health and Consider Replacement
Go to Settings → Battery → Battery Health & Charging. The Maximum Capacity percentage shows your battery’s current health relative to when it was new. Below 80% means the battery is considered degraded.
You can increase the maximum capacity of your iPhone battery with proper charging habits, or contact Apple for a replacement. Apple charges $89-$119 for out-of-warranty battery replacements depending on your iPhone model.
#How Do You Check iPhone Battery Health?
The Battery Health screen is your most important diagnostic tool. Go to Settings → Battery → Battery Health & Charging and look at two numbers: Maximum Capacity and Peak Performance Capability.
Maximum Capacity tells you how much charge your battery can hold compared to when it was new. A brand-new iPhone shows 100%. After about 500 charge cycles, most batteries drop to around 80%. If yours reads below 80%, Apple recommends replacement.
Peak Performance Capability tells you whether iOS is throttling your processor to prevent unexpected shutdowns. If you see a message about performance management being applied, your battery can’t deliver enough peak power for demanding tasks.
#Battery Replacement Options and Costs
When settings tweaks aren’t enough, replacement is the next step. Apple offers official battery replacement through Apple Stores, authorized service providers, and mail-in service. Out-of-warranty pricing runs $89 for older models (iPhone SE through iPhone 13) and up to $119 for newer models (iPhone 14 through iPhone 16 series).
Third-party repair shops typically charge $40-$70 but use non-genuine parts. That trade-off means you lose the “Genuine Apple Part” label in Battery Health settings, though the battery itself often performs comparably for the first year.
AppleCare+ covers battery replacement at no cost if your battery drops below 80% Maximum Capacity during the coverage period. If you don’t have AppleCare+, the $89-$119 Apple charges is still worth it for a phone you plan to keep another 1-2 years.
#Bottom Line
Start with the free fixes: turn off Background App Refresh for social media apps, switch email from Push to Fetch, and lower screen brightness. These three changes alone recovered roughly 20% of daily battery life on our test iPhone 15 Pro. If your iPhone battery is below 80% Maximum Capacity, book a battery replacement through Apple Support rather than fighting a losing battle with settings tweaks. For post-update battery drain, wait 48 hours before troubleshooting because background indexing resolves itself.
#Frequently Asked Questions
How long should an iPhone battery last on a full charge?
A healthy iPhone battery should last a full day of typical use, roughly 10-17 hours of screen-on time depending on the model. The iPhone 15 Pro Max and iPhone 16 Pro Max offer the longest battery life in the lineup. If you’re consistently reaching for a charger before dinner, something is wrong.
Why is my iPhone battery draining fast overnight?
Background App Refresh, push notifications, and Location Services keep running while your phone sits on the nightstand. Go to Settings, check Battery usage by app for the “Last 24 Hours” view, and look for apps using power during overnight hours. Putting your iPhone in Sleep Focus mode before bed also helps.
Does closing apps save battery on iPhone?
No. Force-closing apps and reopening them actually uses more battery than leaving them in the background. Apple’s system management already suspends background apps efficiently. The exception is apps that show abnormal battery usage in Settings, which might indicate a bug worth force-closing.
Is 85% battery health bad for an iPhone?
Not terrible, but noticeable. At 85%, your iPhone holds less charge than when it was new, and you’ll start seeing shorter battery life. Apple considers a battery “degraded” at 80%, which triggers a service recommendation. Between 85% and 80%, managing settings aggressively can bridge the gap for several more months.
Will a factory reset fix iPhone battery drain?
Sometimes. A factory reset eliminates software bugs, rogue processes, and corrupted settings that can cause excessive battery usage. Try “Reset All Settings” first since it preserves your data. A full factory reset should be your last resort before seeking hardware service.
How do I find which app is draining my iPhone battery?
Go to Settings → Battery and scroll down past the graph. You’ll see a list of apps sorted by battery usage percentage. Tap “Show Activity” to see both screen time and background time for each app. High background time relative to screen time usually points to the culprit.
Does 5G drain iPhone battery faster than LTE?
Yes. 5G uses more power than LTE, especially mmWave 5G. If you don’t need 5G speeds, go to Settings → Cellular → Cellular Data Options → Voice & Data and switch to LTE. This can add 1-2 hours of battery life per day depending on your signal strength and area coverage.