iPhone 16 Plus battery drain after iOS 26.4 update

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iPhone 16 Plus battery drain after iOS 26.4 update

After updating to iOS 26.4, my iPhone 16 Plus battery is draining quickly. Before the update, it lasted until the next morning with around 35% to 50% left based on usage. However, after the update, it's draining below 20% every night even with similar usage and also less usage than usual.

Now, every night I receive an adaptive power notification even though I am not using more. Additionally, it was slightly overheating. I actually limited my charge to 90%, but now it sometimes after reaching 80% it stays at the same percentage for nearly half an hour or an hour.It doesn’t even cross 1% past 80, and after a long time it slowly starts to charge to 90%.

Also,It didn’t overheat while charging and also didn’t display a “charging on hold” notification.

iPhone 16 Plus, iOS 26

Posted on Mar 31, 2026 12:19 PM

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SravanKrA

Level 10

433,250 points

Apr 1, 2026 1:06 AM in response to sumanth666

If battery life is less than expected after an update

If you notice that your battery life has decreased after updating your device, wait a few days and then check again.

Even though you can use your device immediately after an update, certain tasks related to the update continue in the background and may affect battery life and thermal performance. While they’re ongoing, you may see the Insight Ongoing iOS Update in Settings > Battery.

The measure of battery health deterioration/drainage is subjective and can vary depending on individual usage patterns. There is no universal standard to determine whether the battery health deterioration/drainage is normal or abnormal because it heavily relies on how the battery is used and maintained.

Protect & Prolong the Life of your iPhone's Battery:

Try to monitor Battery usage by iPhone Activity as shown below

What is shown under battery usage? Checking that would give you an indication of the usage behavior.

Background Activity
Notifications
Connected to Charger
Or any Other

Try some of these options too.

To prolong the life of your iPhone battery, you can follow these tips and best practices:

Optimize Battery Charging: Enable the "Optimized Battery Charging" feature on your iPhone. It helps reduce the wear on the battery by slowing down the battery aging process. You can find this option in Settings > Battery > Battery Health. About Optimized Battery Charging on your iPhone - Apple Support (IN)
Avoid Extreme Temperatures: Extreme temperatures, both hot and cold, can negatively impact your battery life. Avoid exposing your iPhone to excessive heat or cold, such as leaving it in direct sunlight or in a freezing car.If your iPhone or iPad gets too hot or too cold – Apple Support (UK)
Use Original Chargers and Cables: Always use Apple's original chargers and cables or certified third-party accessories. Low-quality chargers or cables can damage the battery and reduce its lifespan. Identify counterfeit or uncertified Lightning connector accessories - Apple Support (IN)
Avoid Draining the Battery to Zero: Charge it whenever the charge becomes lower than 20%. The rest is up to you when to charge. how long to charge, how often to charge, which adapter to use starting from 5W to 140W USB-C Power Adapter etc.
Optimize Display Settings: Adjust your display settings to optimize battery life. Lower the screen brightness, enable auto-brightness, and use shorter screen timeout durations. Adjust the display and text size on iPhone - Apple Support (IN)
Minimize Background App Refresh: Limit the number of apps allowed to refresh in the background. Go to Settings > General > Background App Refresh and disable it for apps that don't require real-time updates. Switch apps on your iPhone, iPad, or iPod touch - Apple Support (IN)
Disable Push Email: Push email notifications can drain your battery quickly. Instead, set your email accounts to fetch data manually or at longer intervals. You can change this setting in Settings > Mail > Accounts > Fetch New Data.

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