Excessive idle battery drain after 13.4.1 update

I updated my iPhone 7 Plus to 13.4.1 earlier this week. Ever since, I am noticing that my battery drains excessively overnight. Here is a screenshot from yesterday night:

As can be seen, the battery was fully charged at 2:22 a.m and the phone was unused until 11:20 a.m. In these 9 hours, battery drained from 100% to 78% with absolutely no use. Even the battery stats don't show any misbehaving apps.

Also, I was checking the settings to understand why it happened, and my battery dropped from 78% to 69% in less than 10 minutes.

All these problems have started after the 13.4.1 update.

Phone: iPhone 7 Plus

Battery capacity: 85%

Anyone else facing this issue?

iPhone 7 Plus, iOS 13

Posted on Apr 8, 2020 11:45 PM

Top-ranking reply

Sridhar Ananthanarayanan Author

Level 1

83 points

Posted on May 5, 2020 12:22 AM

It is definitely a software bug. Until 13.4, everything was fine on my phone (iPhone 7 Plus), and there was no problem with battery (Battery health is at 85% for over 6 months now). I always leave everything ON (Bluetooth, mobile data, WiFi, location, etc.) and the battery graph would be flat overnight.

This problem started with 13.4.1, which bought fixes for Bluetooth and FaceTime (ironically I didn't have any problems with either before the update). You can do the following:

1. Turn OFF both Bluetooth and FaceTime from Settings before going to sleep.

2. If the above doesn't help, turn on airplane mode before going to sleep.

In my case, I haven't turned off or tweaked any other setting to save battery. I mean background refresh is allowed for essential apps, location is ON and allowed for essential apps ('always' for Google Photos and 'when using the app' for maps, etc.).

The only thing I do before going to sleep is turn OFF Bluetooth from settings (WiFi stays ON). And my battery holds on well (flat battery graph) until I wake up the phone in the morning.

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Excessive idle battery drain after 13.4.1 update

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