iPhone battery drains significantly after 26.5.1 update

To visualize the rate of drop, post the screenshot of Settings > Battery > View All Battery Usage that includes the 2 battery graphs and the top 5 apps that are consuming the battery.

If it has not been longer than the 4 days where you are expected to see increased Battery drain, heat, and lag with the new files being indexed in the background, then you should wait until after that time. The Apple Support Article that details what you should expect after a software update is detailed below. That is why we see the same posts about battery drain after every update.

About Apple software updates - Apple Support

Screen Time is a poor metric to use when considering battery drain, as it does not take into account Background Processes performed by some apps, even when the phone is not being used.

Sam_1986 wrote:

Yes, that’s why I waited for a week before posted here. I didn’t see any background app that taking up a lot of usage. But here is the screenshot

Test for a day by removing the Facebook app. Showing 17% Battery drain for only 50 minutes of using the Facebook app is excessive. You can always use Facebook on the web during that test day without the same battery draining.of the app.

Selecting the day before in the blue battery graph will show you a full day of battery usage for a more complete picture of app usage.

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:

1. About the battery usage on your iPhone, iPad, and iPod touch ...
2. Batteries - Maximising Performance - Apple (IN)
3. iPhone Battery and Performance
4. About Charge Limit and Optimised Battery Charging on iPhone - Apple Support (IN)

• Find out what to do if Optimised Battery Charging doesn’t activate.
• Find out what to do if your device stops charging unexpectedly.
• Find out what to do if you think your battery is draining too quickly.
• Find out how to charge and maintain your iPhone 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.

1. Background Activity
2. Notifications
3. Connected to Charger
4. 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:

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

1. 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)
2. 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)
3. 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)
4. 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.
5. 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)
6. 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)

Are any of the apps showing excessive background activity?

Same issue here on iPhone 17. Since this update: awful battery life (adaptive powers turns automatically on, even on regular day) and lots of lags and slowdown. It's been a month or so since the update, and on my side nothing changed. Before this update, I never had to complain about anything

Are you charging to 100% overnight?