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iPhone Calendar app excessive battery drain: How to Fix

In this guide, we will show you the steps to fix the excessive battery drain issue on your iPhone due to the Calendar app. When you hear about battery drainage issues, then you might guess quite a few names that could be categorized as the culprits. However, we are pretty sure that Calendar won’t be one of them. But that is exactly what seems to be the case as of late.

Numerous users have voiced their concern that the Calendar app is hogging an astronomical amount of battery from their devices. Users have reported that if they check the Battery stats for the past 24 hours, then the Calendar app is sitting right there at the top, running for over 15 hours in the background and around 83 hours in the last 7 days.

Correspondingly, it seems to hog around 40% of the battery which is definitely not what one would expect from an app belonging to this domain. What makes the matter worse is the fact that Calendar isn’t even present under background app refresh, so you cannot disable its background activity as well. With that said, there does exist a nifty workaround that shall help you resolve this bug. So without further ado, let’s check it out.

How to Fix iPhone Calendar app excessive battery drainiPhone Calendar app battery drain

Nearly all the users who were getting bugged with this issue had one thing in common- they were all using the Apple Watch. Upon further debugging the issue, it turned out the issue is the watchOS. So here’s what you need to do to rectify this bug once and for all.

  1. To begin with, long press the Calendar app and select Re-Arrange App.
  2. After that, tap on the minus icon to remove this app from your device.
  3. Now unpair your Apple Watch from your device.iPhone Calendar app battery drain
  4. Then reinstall the Calendar app on your iPhone from the App Store.
  5. Finally, pair your Apple Watch with your device and the issue should be rectified.

That’s it. These were the steps to fix the Calendar app excessive battery drain issue on your iPhone. If you have any queries concerning the aforementioned steps, do let us know in the comments. We will get back to you with a solution at the earliest.


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  • I am having this issue and I do not have an Apple Watch. It started after I upgraded my iPhone SE 2nd generation to iOS 16.

  • Steve Rauch

    I have this calendar constant background activity/battery drain on my iPhone 13 Pro running iOS 16.1.1 and I do NOT have an iWatch. Any suggestions? And when you suggest to remove and reinstall Calendar app, do you mean to “remove from desktop” or “delete app”? If deleted, what happens to all the calendar data? Will it reappear after reinstall?