iOS 15.2 Battery Drain

1. Iphones are designed to be charged all night every night. Many housekeeping jobs are designed for the phone to be on charge and locked. 20% overnight is not unusual - it is 1/3 of a day after all. Do not leave it off charge overnight.
2. An old battery can self-discharge even at 84% so try this test.

Check iphone battery for self discharge

Many people experience battery drain after updating to a new point version. The spotlight index has to update and if you have autoupdate turned on you will get a lot of downloads. Give it 72 hours and see what happens.

raffeph wrote: "...Please fix the problem with next update!!!"

raffeph ~ We can't "fix the problem with next update" – because we're just users like yourself. Ask Apple to fix it here:

Feedback - iPhone - Apple

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namra64 wrote: "plz release another ota update to fix this..."

namra ~ We can't "release another ota update to fix this" – because we're just users like yourself. Ask Apple to fix it here:

Feedback - iPhone - Apple

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ali83iraq wrote: "...i replace the battery yesterday..."

ali83iraq ~ Was the replacement done by Apple or Apple Authorized Service Provider, or approved Independent Repair Provider?...

About genuine iPhone batteries

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AndrewBuckle wrote: "...my iPhone 7. Hardly lasts..."

Andrew ~ With an older iPhone model such as your iPhone 7, it's worth checking the battery. If it's still the original 5 year-old battery, the long process of applying an iOS update can strain a weak, aging battery and be "the straw that broke the camel's back".

Does your iPhone 7 still have its original battery?

What's the Maximum Capacity % here?...

Settings > Battery > Battery Health

...And is there an "Important Battery Message" there? [Ref: Apple]

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AndrewBuckle wrote: "yes, original battery and it is listed at 91%. Perhaps that is the case that it is worn out (only recently got the phone, it is not an old phone ... about a year old)"

Andrew ~ Regardless of that unexpectedly high 91% capacity, the original battery is 5 years–old so due for replacement. (And its age would explain the iPhone 7's symptoms.)

iPhone Battery & Power Repair

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oldtimer2021 wrote: 'IPhone 7"

oldtimer ~ With an older iPhone model such as your iPhone 7, it's worth checking the battery. If it's still the original 5 year-old battery, the long process of applying an iOS update can strain a weak, aging battery and be "the straw that broke the camel's back".

Does your iPhone 7 still have its original battery?

What's the Maximum Capacity % here?...

Settings > Battery > Battery Health

...And is there an "Important Battery Message" there? [Ref: Apple]

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oldtimer2021 wrote: "the phone is 4 years old. the battery charge capacity has dropped to 83% no message from Apple..."

oldtimer ~ 83% isn't healthy and, being 4 years–old, your iPhone 7 may refuse to start up in the coming months or year. If you'd prefer to avoid that possible situation, have the battery replaced sooner rather than later:

iPhone Battery & Power Repair

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tay292 wrote: "Mine iphone 7. "

tay ~ With an older iPhone model such as your iPhone 7, it's worth checking the battery. If it's still the original 5 year-old battery, the long process of applying an iOS update can strain a weak, aging battery and be "the straw that broke the camel's back".

Does your iPhone 7 still have its original battery?

What's the Maximum Capacity % here?...

Settings > Battery > Battery Health

...And is there an "Important Battery Message" there? [Ref: Apple]

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jahanzaib176 wrote: "I have an IPhone 12 mini and the battery health is at 91%. Keeping that in mind after IOS 15.2 the battery is draining faster than usual. Standby time is alright but watching youtube decreases battery at an exponential rate"

jahanzaib ~ Let Apple know here:

iPhone Feedback

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jackv3 wrote: "It's not possible to report a bug. Apple allows selecting version 15.1 (and older) of iOS. Quite strange...."

Yes, it is strange. So I just sent feedback about their iPhone Feedback page via this Website Feedback page(!)...

Website Feedback

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One more final post here for same topic.

To confirm my observations, I left my phone with iCloud account connected in settings yesterday. As predicted (I played with the buggy SW for some time) the battery drain was quite huge. I logged out from my AppleId account in the morning, and to my surprise, nothing has changed. Then after 12pm, I've remembered that I have another appleId account connected in Mail settings (only to read e-mails from previous, old account). I deleted it and now as predicted - battery consumption dropped to ~0%.

So conclusion from this (and previous) measurements are that no matter how I use ApppleId, if my 12mini is connected to AppleId, through:

• "Login to iCloud" in Settings,
• second Mail AppleId account in Mail settings,
• AppStore (to download new apps),
• Music (to listen to paid music).

some bug in 15.2 (or on server side - who knows) makes some background process work continuously which results in battery drain.

The bug is so obvious ( and I think concerns not only me) that I count on Apple to resolve it in next release.

faizal73 wrote: "...battery not genuie appler battery . . but , before nothing problem ."

faizal ~ Apple says: "Using nongenuine batteries might also result in unexpected behavior after installation, device software updates, or while charging. Using nongenuine batteries might also lead to safety issues." Source:

About genuine iPhone batteries

...So have the nongenuine battery replaced with a genuine one:

iPhone Battery & Power Repair

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jackv3 wrote: "faizal73 reported problem with draining battery after upgrade, not after battery replacement..."

jackv3 ~ faizal73 has both situations: a draining nongenuine battery after a device software update, exactly as Apple warns: "Using nongenuine batteries might also result in unexpected behavior after installation, device software updates, or while charging. Using nongenuine batteries might also lead to safety issues." Source:

About genuine iPhone batteries

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