iPhone battery drain since iOS 15.7.1 update

For the first 72 hours after an update while the phone is reindexing spotlight it will use more battery. If it persists after that go to Settings > Battery > Health and see what the percentage is. If it is 80% or lower you need a new battery.

I Have had the same type of battery readings. But I don't think it is real. The power goes down very fast without heating the unit. Which is impossible. It can go down from 90% to something like 10% and a very short period of time. What I have found out though is if I turn the unit off and back on again It is often back up to 90% or if I don't turn it off and attempt to charge it it will go from 10% to 90% in just a matter of 10 or 15 minutes. Also impssible. I don't think there is a battery problem. I think there is a software problem.

No actually, ios 15.7.2 is available now for public update after the trail with rc, you must try with this update and so far after updating to this software I’ve tested it with my Geekbench software performance was good and likely to be from ios 15.7, scores were good, battery is expected to be fine but nothing gone wrong till now

The lowest score by ios 15.7.1 and the better one is given by 15.7.2

DJDools wrote: "If it's simply down to battery health (mine is 80%), then why did the issues arise once upgrading to IOS 15.7*?"

Simple: The long process of applying the iOS update put strain on your unhealthy 80% battery and was the proverbial "straw that broke the camel's back." (Users often mistakenly blame the iOS upgrade instead of their weak, degraded battery.)

And don't wait to replace the battery – as they tend to fail gradually and then suddenly. You may then find that your iPhone is 'bricked' and you can't prepare it properly for battery replacement.

iPhone Battery & Power Repair

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Do you have any deactivated SIM cards in your phone? I thought getting rid of it would drain the battery but instead it helped it. And why isn’t my iPad Air 2 affected? It can even last 2 weeks. My friend’s iPhone 7 is doing just fine.

updated my wife's 6s to 15.7.1 last night - it has completely broken the battery usability. Goes from holding a charge for a couple of days to losing it completely in about 5 seconds. A few minutes on Google shows that it appears to be fairly common, almost as if it's a deliberate policy by Apple to make products obsolete. This change in battery performance occurred instantly after the 'upgrade' so I don't accept that it is due to natural degradation. Will be moving to Android based phones.

Best thing you can do for your battery is plug the phone into the power adapter and let it charge overnight.....every night.

Since updating to iOS 15.7.1, my iPhone 7 battery level goes from 95% at 9pm down to 0%-3% by 7am next morning, and that’s with almost zero use and NO apps open/running. My phone used to be able to idle for days between charging. I had battery replaced 1 year ago and Battery Health shows 97%.

Any thoughts?

The case could be the major bug fixing over the kernel issues and that might affect the battery life,even I own an iPhone 7 and replaced the battery earlier this month and it's health is almost 100 now and still I could the same issue like the battery drain even at no usage point.

I request apple to release another update to rectify this issue and it's not worth for apple to kill older and the most successful iPhone in such a way that haven't expected ever.!!

My phone does the same exact thing with 92 percent battery health. I think it’s done to get people to buy a new phone. Since I updated it has gotten worse with iOS 15.7.1 as you had mentioned. I finish charging my phone to 100 percent before bed and the phone drops to 20 percent by the time I wake up. I had iOS 13 just before and it was manageable only dropping one percent an hour without any use. There is no reason the phone should be dropping more than one percent a hour not doing anything at night.

now I also have another iPhone which I refuse to update which is running on the first factory iOS which has a battery life which is almost the same as how I got it out of the box. Only drops five percent when I am sleeping.

the issue is many aps now require the latest iOS to work or else you can’t use them. Also the web browser if you don’t update iOS you can’t load web pages. So if you are fine with a basic phone on old iOS- then no problem

Same here. My battery health is 80%, and all was fine until I upgraded to IOS 15.7*? I was on IOS 14 before and the battery would last about 5 days! Now, it's draining within 12-16 hours. And it will suddenly go down to 1%, then I do a soft or hard restart and it jumps up to 88% (on low power), and then I can literally watch it go down in 1-2% increments every few seconds. I have nothing running the background etc.

iPhones are designed to run on the iOS they were released on. Newer iOS software may drain the battery.

iPhone 6s - same problem. My battery shows 100% in health, but drains from a full charge to 33% in less than 4hrs. I love my phone and this upgrade really stinks!!!

ios 15.7.1 just kills the battery. there is an hour to complete discharge. In the cold, it discharges from 100% to 1% in a couple of minutes!!!