My iPhone has been using huge amounts of battery power for almost 2 weeks now – ever since I upgraded to iOS11.  It can drop 20% of it’s battery percentage in an hour and it’s using so much power that it takes 5 hours to charge! I’m keen to see who else is having this problem and whether it’s resolved itself for you.

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After some reading I am hoping that this increase in power usage on iOS11 is caused by Spotlight reindexing.  This would also make sense as to why all the power saving measures such as low power mode etc make no difference.  It also makes sense as to why the battery drain doesn’t seem to be tied to any particular application.  If this is the case, all we need to do is wait a few days and the iPhone should finish indexing and eventually return to its normal self. If however it’s some kind of a bug in iOS11, we may need to wait for a fix from Apple. If it is caused form Spotlight indexing, waiting should eventually fix it.  If you are camping or in a situation where you you need the phone and cannot put up with the battery drain you have 3 options:

UPDATE: It’s not caused by Spotlight indexing. I turned off all indexing and the problem is still there.

I’m contacting Apple Support and will keep you updated.

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Many iPhone users are noticing a fast drain in battery life in iOS 11. You can check which apps are using your battery by going to Settings –> Battery and then scrolling down to where it says ‘BATTERY USAGE.’ You will see a screen like this:

This is a very handy chart that lets you see which apps are using your battery. For me, it’s Google Play Music. I admit, I do use the Google Play Music App a lot to listen to music.

If you click on the App in question, it will tell you how much you have used it. I clicked on Google Play Music and it told me that I have used it for 2.3 hours on the screen and 4 minutes in the background over the last 24 hours.

Click on the app name to see whether the usage is when the app is on screen or in the background.

You can look at your battery drain over the past 24 hours, or the past 7 days.

For hints on how to save battery life, check out “iOS11 battery drain problems”.