When an iPhone 16, 16 Plus, 16 Pro, 16 Pro Max or 16e loses charge faster than it should, Apple's order is to let the phone tell you why before you change anything: update iOS, open Settings, Battery and read the suggestions and Insights above Daily Usage, then look at which app or system activity used the most. Two findings explain most cases: a recent update or restore still finishing in the background, and an app that runs in the background or wakes the phone with notifications. If both are clear, check signal strength, turn on 5G Auto, use Adaptive Power or Low Power Mode, and only then look at Battery Health for a Service message.
Differential
Likely causes of “Apple iPhone 16 family battery drains too quickly”, and how to tell them apart
- 1
A software update or restore is still finishing in the background
What separates it Battery use is high and the phone is warm for a few days after an iOS update, a new setup or a restore from backup
How to confirm Open Settings, Battery: Apple's Insights say Ongoing iOS Update or Ongoing Device Setup while the work is running, and Apple says to wait a few days and check again
- 2
One app is running in the background or waking the phone with notifications
What separates it The App and System Activity list shows one app far above the rest with a Background Activity or Notifications label
How to confirm Tap that app in Battery for its own chart, then switch off Background App Refresh or its notifications and compare tomorrow's chart
- 3
The phone keeps searching for signal
What separates it Battery falls fastest in a basement, a car park or a rural area, and the list shows No Mobile Coverage and Low Signal
How to confirm Watch the drain in a strong-signal spot; where you know there is no coverage, Airplane Mode stops the search, and Apple says Wi-Fi uses less power than cellular
- 4
5G is used where it gives no benefit
What separates it Cellular data use is high on a 5G plan and the phone stays warm during ordinary browsing
How to confirm Turn on 5G Auto under Cellular Data Options, Voice and Data, which switches to LTE when 5G would not feel faster; Apple lists it for iPhone 12 and later, so it is on every model in this family
- 5
A worn battery that no longer holds its capacity
What separates it Drain is steady on every day and every app, the battery drops in steps, or Battery Health shows Service
How to confirm On these models open Settings, Battery, Battery Health; a Service message means Apple recommends replacing the battery
Before you touch a setting
Record this first — changing settings destroys the evidence
- Which of the five models you have, and the model number under Settings, General, About (A3081, A3082, A3083, A3084 or A3212 for the main model)
- The iOS version and whether the phone was updated, restored or set up in the last three days
- Battery Health capacity and whether Service is shown, plus the top three apps in App and System Activity for today
- Where the drain happens: idle overnight, on cellular, on Wi-Fi, or while the camera or navigation is in use
Try in this order
0 of 7 completedUpdate iOS and read the battery suggestions
ReversibleOpen Settings, General, Software Update and install the update if one is waiting, then open Settings, Battery. Apple shows suggestions such as turning on auto-brightness or auto-lock just above Daily Usage; act on the ones that apply before doing anything else.
Check whether a background job explains it
ReversibleIn Battery, look for an Insight that says Ongoing iOS Update or Ongoing Device Setup. Apple says these tasks continue after an update or setup, that they raise battery use and heat for a while, and that battery life returns to normal when they finish, so wait a few days before judging the battery.
Find the app that uses the most
ReversibleUnder Daily Usage, read the three apps at the top of App and System Activity Usage and tap one to see its own chart. A Background Activity label means it used most of its power while you were not looking at it; Notifications means its alerts kept waking the phone.
Fix signal and radio use
ReversibleConnect to Wi-Fi where you can, because Apple says Wi-Fi uses less power than cellular, and use the phone somewhere with a strong signal. Under Settings, Cellular, Cellular Data Options, Voice and Data, choose 5G Auto so the phone drops to LTE when 5G gives no faster experience.
Use Adaptive Power and Low Power Mode
ReversibleAdaptive Power needs iOS 26 or later and is available on the iPhone 16 models; it predicts a heavy day and adjusts performance to make the battery last, and can switch Low Power Mode on for you. Low Power Mode is under Settings, Battery, Power Mode and reduces Mail fetch, Hey Siri, Background App Refresh and some visual effects until the phone is charged above 80 percent.
Open Battery Health
ReversibleGo to Settings, Battery, Battery Health. If you see the word Service next to Battery Health, Apple says to consider replacing the battery; otherwise the battery is not the reason and the drain is coming from settings or apps.
Test overnight before deciding
ReversibleCharge to full, leave the phone idle on Wi-Fi overnight and read Battery in the morning. A loss of a few percent is normal; a large loss with nothing running points back to an app with background activity, and only then to service.
Model-specific
What is true of this model and not of its siblings
- Battery by model
- GSMArena lists 3,561 mAh (iPhone 16), 4,674 mAh (16 Plus), 3,582 mAh (16 Pro), 4,685 mAh (16 Pro Max) and 4,005 mAh (16e). Its endurance ratings are 37, 48, 37, 48 and 41 hours; the 16e's active use score of 11 hours 53 minutes is the lowest of the five.
- Chips and displays
- The 16, 16 Plus and 16e use the A18; the 16 Pro and 16 Pro Max use the A18 Pro with a 120 Hz LTPO display. The 16e has a 6.1-inch panel at 1170 by 2532, and the 16e is dual-band Wi-Fi 6 where the other four support Wi-Fi 7.
- Model numbers
- Apple's model numbers per GSMArena: iPhone 16 A3081, A3286, A3287 and A3288; 16 Plus A3082, A3289, A3290 and A3291; 16 Pro A3083, A3292, A3293 and A3294; 16 Pro Max A3084, A3295, A3296 and A3297; 16e A3212, A3408, A3409 and A3410. Give Apple the model number, not a part number.
- Tools and supplies
- The phone's own Battery screen, a second charger and cable to compare, a flashlight to look into the charging port, and a soft brush. No screwdriver is needed and you should not open the case.
- Repair cost
- Apple's US out-of-warranty battery replacement fee, as compared by MacRumors in September 2024, is $99 for the iPhone 16 and 16 Plus and $119 for the 16 Pro and 16 Pro Max. The 16e was not in that comparison, so ask Apple for its fee.
- Other models this page answers
- These steps also fit the iPhone 16 Pro, iPhone 16 Pro Max, iPhone 16e.
Stop boundary
When this stops being a self-service repair
- !If Battery Health says Service, book a battery replacement with Apple or an Apple Authorized Service Provider; Apple's US out-of-warranty fee, as compared by MacRumors, is $99 on the iPhone 16 and 16 Plus and $119 on the 16 Pro and 16 Pro Max, and AppleCare+ makes it $0 when capacity is below 80 percent; the 16e's fee was not listed
- !If the phone loses more than a quarter of its charge overnight in Airplane Mode after a restart and an update, contact Apple Support before repeating resets
- !If the case is swelling or the phone is hot to the touch while idle, stop using it and take it to Apple the same day
Evidence ledger
Sources behind this answer
Where the manufacturer's article stops. Apple does not publish per-model runtimes, so the lab figures are third-party.
Battery suggestions, Insights, Daily Usage, 5G Auto, Adaptive Power, Low Power Mode and Battery Health.
Operating range and what heat does to battery life.
Battery capacity and lab endurance for the iPhone 16.
Active use score and charge times for the Pro Max.
Apple's US out-of-warranty battery fees by model, September 2024.
Exact questions
Common questions
How long should the iPhone 16 battery last?+
GSMArena's lab tests measured an Active Use Score of 15 hours 42 minutes for the iPhone 16, 18 hours 49 minutes for the 16 Plus, 14 hours 17 minutes for the 16 Pro, 17 hours 18 minutes for the 16 Pro Max and 11 hours 53 minutes for the 16e. Those are standardized tests, so your own figure will differ.
Is the battery in the Plus and Pro Max larger?+
Yes. GSMArena lists 3,561 mAh for the iPhone 16, 4,674 mAh for the 16 Plus, 3,582 mAh for the 16 Pro, 4,685 mAh for the 16 Pro Max and 4,005 mAh for the 16e, so the larger phones last measurably longer on the same use.
Why is my new iPhone 16 draining fast for the first days?+
Apple says a restore, a first setup or a major update leaves work running in the background that raises battery use and heat until it finishes; the Insight in Settings, Battery tells you when it is still going.
Does the ProMotion screen on the Pro models use more battery?+
The 16 Pro and 16 Pro Max have an LTPO OLED display that runs up to 120 Hz, while the iPhone 16, 16 Plus and 16e use a standard OLED panel, so screen settings matter more on the Pro models when brightness is high.
When does Apple say to replace the battery?+
When Settings, Battery, Battery Health shows Service. On iPhone 15 and later that page is called Battery Health; older iPhones use Battery Health & Charging.
What does a battery replacement cost?+
MacRumors' comparison of Apple's US fees, published September 2024, lists $119 for the 16 Pro and 16 Pro Max and $99 for the 16 and 16 Plus outside warranty; fees change, so confirm with Apple before you book.
Is it safe to use Low Power Mode all the time?+
Apple designs it as a temporary mode: it reduces Mail fetch, Hey Siri, Background App Refresh and some visual effects, and it switches itself off once the battery is above 80 percent, so you turn it back on when needed.