IOS 27 battery drain issue

G_55_D wrote:

100% having the same issue. Updated to iOS 27 last night and within 2 hours of waking up my battery is on 81%. I hate this

Last night? You have about 4 more days to go where you will see increased battery drain while the files are being indexed in the background. There is also Siri & Search Optimization being performed and updated object detection algorithms on all of your photos.

You should be using Optimized Charging and charge your phone all night, every night. This will give you the best chance for those processes to be performed quicker. Not only will you see increased battery drain during this time, but also increased heat and you may see some UI lag. This is not specific to iOS 27 and occurred on previous updates as well, Apple has even provided a Support Article to explain this and what to expect immediately after the update. That is also why you always see these same posts after every update.

About Apple software updates - Apple Support

ge_almazan76 wrote:

same here. after updating to ios 27 last week, the battery drain is insane. hope this gets fixed by the next update. thank you

• Post the Battery Health percentage on your device at Settings > Battery > Battery Health?
• Post the screenshot of the 2 battery graphs and the top 5 apps consuming your battery at Settings > Battery > View All Usage.

After every update, you always see the same posts about the update causing battery drain and that is due to the background processes that are performed after the update. That was true for iOS 26, iOS 18, and even those before that where those posts are still visible in this forum. For most that takes about 4 days, but with iOS 27 there are additional Search & Siri Optimizations that are performed so you may see a couple days more. Not sure what day you updated last week, but if it has been at least 6 days, then post the requested information.

Something that might help with battery on iOS 27: turn off Connectivity Assist. It's Wi-Fi Assist with a new name and a new spot in Settings.

When your Wi-Fi gets weak or stops loading, your phone jumps over to cellular to keep things working, then jumps back. On spotty Wi-Fi it can do that over and over. All that back and forth keeps the cellular radio busy, and that drains the battery.

You have to turn it off in two places. First, go to Settings > Wi-Fi, scroll down to Connectivity Assist, and turn it off. Then tap the little (i) next to the network you're on, scroll down to Connectivity Assist again, and turn that one off too.

That second step is the one people miss. I turned off the main switch and it was still on for my home network.

MBILC wrote:

Sounds like another "Battery-Gate" like when Apple did those changes to older models claiming it was to "protect the battery" meanwhile they then reverted it due to the backlash, was more like a way to try and force people to buy a new phone :D

But in this case, it is also happening on iPhone 18s....

You battery graph only shows 4 days of use which means the background processes are still being performed to index the files in the background. The first day you have post is so negligible I would not even count it. None of your tweaks will do any good and truthfully even after indexing, crippling your phone in that way will have little effect on battery usage. It has been seen to take about 5 - 7 days to fully complete. Downloading and indexing the Siri AI models may even take longer.

You need to plug your phone in and have it connected to power all night, every night for those processes to complete faster. This happens after every update and setting up a new phone and also why you see those same reports over and over again until they eventually go away once they let their device finish the spotlight indexing. It is so prevalent that Apple even long ago added a Support Article explaining that you should experience battery drain, increased heat, and even some UI lag until that indexing has completed.

About Apple software updates - Apple Support

People report the same thing after every update, and you can even go back in this forum and see the same thing for every new device and every new iOS update. None of that is unusual and as always, you never hear another thing about it after a couple of weeks. It was the same for iOS 26, iOS 18, iOS 17, iOS 16, etc, have a look.

The only thing missing from your screenshots are the apps consuming your battery after you tap View All Battery Usage on that screenshot. Go ahead and post both Battery Graphs you see there along with at least the top 6 apps and also on the bottom there is a section for System Usage, so post if you see anything there.

What is the purpose on going off an a Battery Gate tangent. That was nothing to do with battery draining and was for throttling the CPU. If that was going on, you would actually have longer battery usage. It seems like you may be confused and nothing was reverted. The only change was that you they added a message in Settings that tells you in Peak Battery Performance that your CPU is being throttled and you can turn it off where you may experience shutdowns due to the battery degradation. The CPU was throttled then and still continues to this day for that same reason.

Ayush_27_0 wrote:

https://discussions.apple.com/content/attachment/e5d60031-0122-4c5e-b1c7-a34f2ae212d7

Not enough data is represented in the apps using the battery since you are showing today and that is only for a couple of hours. What you need to do is tap View All Battery Usage and post both battery graphs on that page and the top 5 apps consuming the battery. On the first daily graph, choose Yesterday so the data shown below that for app usage will include a full days worth of data. The graph indicates quite a bit of Background Activity being used and that will show which apps are the cause of the battery drain for that day. If you have a significant amount showing on the bottom of that page under "Other Battery Usage", then post that too.

Also we don't know what your Battery Health is, so let us know what yours is at Settings > Battery > Battery Health.

Iphonekuttan wrote:

I updated last month. Now ibam facing serious daining issue. Is there any option???

Yes:

• Post your Charge Cycles and Battery Health percentage.
• Post the screen shot at Settings > Battery > View All Battery Usage showing the 2 battery graphs and the top 6 apps consuming your battery. If you see a high amount of usage on the bottom of the screen under Other Usage, then post that as well. If you see a lot contributed to Home & Lock Screen, then that usually indicates indexing is being performed or you have a widget on screen that is working overtime and I would try removing the onscreen widgets to test.

Once you determine what is using the battery, testing is simple by removing the app and comparing your results.

Certainly Meta apps are usually top consumers of your battery if you have any installed. While their apps are free to use, their revenue is created by the harvesting of your data to build your Social Graph and sell that information to advertisers. Also most of them are being updated as much as 13 times every month and especially with a new OS update due to their use of non-standard text fields. The reason why they use the non-standard text fields is that they can use the data as you type to integrate with their Meta AI that uses much more processing power than Apple Intelligence or Siri Suggestions. To test if there is improvement with your battery performance without those apps, you can use their online versions, such as Facebook, Instagram, etc, where the background processes of the app are not being used.

AppleisNotGoodAnymore91 wrote:

Still an issue for me. Just updated to the new iOS last night and after a few hours my phone is already half dead when it would be maybe 75% before.

this is ridiculous. Apple is being anti consumer to the extreme

It does not appear you have read the Support Article that has been posted many times in this thread for what to expect immediately after any update. Yes, you should be seeing increased battery usage and increased heat that will continue for about 5 days while the background processes continue to index the files, while still letting you use the device.

About Apple software updates - Apple Support

Make sure you are leaving your phone plugged into power and connected to WiFi all night, every night, so that indexing will finish quicker. That is also why we see the same post after every update and you can find the same for iOS 26, iOS 18, iOS 17, etc, yet we still get posts where a user has just updated and don't know why their battery is draining.

Anperezna wrote:

Espero que lean los comentarios de la comunidad y arreglen lo antes posible esta versión de m***da.

Apple does not read here in this user-to-user forum for feedback or suggestions. You can, however let them know your thoughts here:

Product Feedback - Apple

DirtDirtDirtDirt wrote:

I have been around for plenty of iOS updates, and I understand a new update is not going to be perfect right off the bat. However, after only 1 1/2 hours of use I'm down almost 40% this morning. I realize this will probably get patched in a future update but the sooner the better, I don't make it through the day any longer without having to charge my phone. My capacity is at 88%, which isn't bad. So, I want to submit my info to try and get a fix for this going asap. My phone finished indexing last week and it hasn't improved the battery life in several days since. It's about the same.

Official Apple Support Community

Official Apple Support Community

According to your Daily Graph, you are still experiencing quite a bit of background activity. For a better picture of App Usage, I would choose yesterday in your daily graph so the data shown is for a full day and not just a few hours in the current day and post what you see there.

If there is an indexing process stuck after updating the OS, I would recommend to perform a Force Restart. Some users will do this after any update to do some additional house keeping.

• Press and quickly release Volume up
• Press and quickly release Volume down
• Press and HOLD the Side button until the Apple logo appears. This step could take up to 15 seconds while holding the Side button before you see the Apple logo and you have to ignore anything else on the screen including the prompt to Slide to Power Off.

I assume it has been at least 5 days since the update and you are plugging your phone in all night, every night to allow the indexing to complete quicker. I am aware of the notification in Settings for Siri and Search optimization and understand that has completed, but there may be additional indexing performed after an update.

Welcome and thank you for reaching out. 🤗

A rapid battery drain after updating to iOS 27 can happen while the system reindexes and optimizes in the background, usually taking a day or two.

According to Apple: If you notice that your battery life has decreased after updating your device, wait a few days and then check again. Even though you can use your device immediately after an update, certain tasks related to the update continue in the background and might affect battery life and thermal performance. While they're ongoing, you might see the Insight Ongoing iOS Update in Settings ➢ Battery.

If you need more help, contact Apple Support directly.

Take care!

Smiliñ 😎 Brian | Community Volunteer

Chumbanga wrote:

I have a 16 PM and battery issues with the iOS 27 update please look into this.

You are not speaking to Apple here and haven't provided any information for other community members to offer any assistance.

• When did you update?
• Have you let your phone charge all night, every night to let the background processes complete?
• What is your battery health at Settings > Battery > Battery Health?
• Post a screenshot of the 2 battery graphs and the top 5 apps consuming your battery at Settings > Battery > View All Usage.

dmctom wrote:

iPhone 15 Pro Max. Battery drain is so severe that I’m having to charge 2-3 times per day…. Same usage, same apps. iOS 27 has an issue. It’s been weeks

There are 2 things you need to post:

• The Battery Health percentage at Settings > Battery > Battery Health.
• The Screenshot at Settings > Battery > View All Usage that includes both battery graphs and the top 5 apps consuming your battery. I suggest choosing yesterday in your Daily Battery Graph so the app usage includes a full days worth of data to provide a complete picture. If you see a large amount of Other Usage on the bottom of the screen, then post that as well.

Specifically, what app’s are consuming your daily battery capacity? If it were a hardware or iOS issue it would affect all your apps. What you describing is the effect of software developers not optimizing their apps for the new iOS. This is fairly typical for social media apps and games, but it can affect any app.

Dinitha_Wickramasinghe wrote:

I'm having the same issue with my iPhone 17 pro since i have updated to iOS 27. My biggest concern is my phone keep getting Heating even after fully shutdown 😕😕

First 2 days after updating went without an issue. No battery drain, No Heating

But after those 2 days my phone began to heat and drain battery like crazy 😕

I have waited for the iOS 27.0.1 hoping that it would fix the issue. But it didn't either... 😕

I have tried:

1. Factory data reset

2. Turning off siri beta

3. Fresh install iOS via restoring using my MacBook pro

Nothing fixed it yet...

*Only after Turning off wifi completely drops the heat by some amount

My biggest concern is how iPhone keeps getting Heating when it is powered off?? I shutdown my phone before 6 hours of sleeping. Then after waking up i grabbed my phone and noticed it is getting hot even when fully powered off (not powered on yet).

Then after powering my phone on i realized that more than 30% of battery drained during night even when phone was fully shutdown 😕😕

My phone is only just 6 months old. I have another 6 months of apple care warranty. But I'm fron sri lanka we don't have apple stores here. I imported this phone through a reseller by paying 2X the value of the phone

My phone has never dropped. No damages. And no water damages.

I don't know why this happens to my phone 😕

I hope apple will fix my phone with upcoming ios 27.2 🥺 otherwise i will have to ship my phone back to japan and claim apple care warranty. And the process will take about 2 months 😞

Hi, that’s quite a bit of a rant. I get it your frustrated by your experience with your iPhone 17 Pro.

Everyone posting and commenting are just fellow Apple users trying to ease the frustration and bring things down a notch.

Apple and Apple Support don’t participate here. They moderate posts, but that’s the extent. Your post and frustration don’t get escalated to Apple engineering.

You’ve really got one option to achieve a successful resolution to the issue. Open a support ticket and continue to escalate the issue to Apple engineering.

What exactly do you expect just a fellow Apple user to accomplish your behalf?

Normal and expected after a major iOS update. The battery is working overtime and will be for the next few days until everything is indexed on the iPhone.

This problem you described can happen when the phone adjusts to the new update. This takes around 4 days but can take up to 6. I would just wait and see if it clears up in the next week. Keep your phone fully charged when you leave your house pretty soon your phone will have the usual charge you are used to.

wcpoon wrote:

otherwise, Apple please fix this immediately!!!

Sorry, you are not speaking to Apple here, this is just a Community forum where Apple does not participate in providing support or reading requests.

You would need to review the information provided to follow up on your Battery Usage with those screenshots. After updating to iOS 27.2, your device will be indexing, so be prepared for further battery drain and even some extra heat as detailed in the link About Apple Software Updates until those background processes to index the files have completed. Typically it takes about 5 days, but charge your phone all night, every night with it connected to WiFi to allow it to finish faster..

Your Battery Health is right in the ballpark where it is supposed to be. The battery is expected to last 1000 Charges Cycles before needing replacement at 80%, and a reading of 93% may actually be 93.9, but values there are truncated without the decimal. That works out to an average of 50 charge cycles per percentage, where typically it would be 94%, but as you can see, yours is not out of line.

Your battery is fine. The update is still indexing all of the data on your iPhone and will continue to do so for another few days.

I've noticed two major issues with iOS 27 and my iPhone 15 Pro Max:

1. The battery drains insanely fast. With iOS 26 I never had to pay attention to battery life. Immediately after installing iOS 27 I have to charge my phone throughout the day, even taking a battery bank to the gym. At one point I watched the battery drop from 17% to 13% within a couple minutes. And later from 11% to 8%.
2. Multiple GAN chargers and high-wattage USB-C charge cables that worked well with iOS 26 are unreliable with iOS 27. Sometimes they seem to work normally, other times the charging lightning bolt is visible but the battery does not appear to be charging. The same charger and cables work reliably with my iPad Pro (that I will not upgrade) and MacBook Pro.

Battery Health is normal and Search & Siri Optimizations finished days ago but these issues remain.

Anyone else dealing with these issues and found a solution?

Following up on this, yesterday I found this YouTube video explaining a reason for battery drain with iOS 27, and that seems to make sense with current state of both my iPhone and iPad, an improvement of battery performance from one day to the next.

Check it out:

https://youtu.be/on8DdkxGbFk?si=-3_56aTaoK8MJjun

Connectivity Assist also sends traffic over cellular that your Wi-Fi network blocked, so home ad blockers like Pi-hole get skipped. Write-up and proof here: iOS 27: Safari ads bypass Wi-Fi ad blocke… - Apple Community

I am getting really bad Battery Life on my "new" iPhone 17 Pro Max. Getting like 3-4 hours maximum 5 hours screen-on time. I updated first day as the IOS27 came out, and really hoped that it will be better. But 11 days after the updated it did not change, i have already done every possible software thing, did the force restart. Only did not do the Mac restore option. And things are not getting better. Im like really long Apple user, have every bit of their Tech, but I am becoming really disappointed, and thinking of going somewhere else. I do not know if the guys at Genius bar can do anything?

My 17 pro is draining like lake Meade. Been using iphones forever and this is a new experience for me.

while some say they always see this after a major release as if we don’t know what we’re experiencing, what i find is there’s often a raft of sycophant apologists who say it’s fine or our imagination.

i find this battery problem, after several days to be unusual - could be all the new ai stuff, so ill turn all that back off and see how it goes. Something isn’t right and no, ya’ll aren’t tripping.

I have turned off Connectivity Assist in two locations. Low Power mode is on. This has helped but battery drain remains terrible when using cellular connectivity such as streaming a podcast or music. 55% of my iPhone 15 Pro's battery used between 6am and 10am yesterday morning that included one hour of podcast streaming.

Same. 16 pro max. Updated to iOS 27.0.1 two days ago. Battery drains faster, In Find my, location doesn’t update. It shows location from two hours ago. Does not show current location. Other glitches with Apple payments not going through and Face ID recognition not working. Restarted my phone twice and still the same issues. Apple needs another update to fix iOS 27.0.1

To try to stop the rapid battery drain I put my iPhone 15 Pro in low power mode. The battery reduced 12% in two hours. Low power mode helped a lot.

Hi,

I’m experiencing a serious battery drain and overheating issue after updating my MacBook Pro to macOS 27.

My MacBook Pro is practically new — I purchased it about two months ago — and before the update, the battery performance was excellent.

Since installing macOS 27, the behavior has changed dramatically. For example, if I leave the MacBook unplugged overnight, even without actively using it, I wake up in the morning and the battery is completely drained. The MacBook also becomes noticeably warm or hot while it is not being used.

This never happened before the update. Previously, the MacBook could remain unplugged overnight with very little battery loss.

I’m very concerned because the device is almost new, and this issue started only after installing macOS 27. Please investigate whether this is a known issue with the latest update and advise on how it can be resolved.

[Edited by Moderator]

Yup even my 17 pro max is draining really bad since updating to ios 27. I even got the message stating that “your iPhone has been used more than usual since upgrading ios, and this may affect battery life”.

i hope this gets rectified before the battery life actually goes bad.

The same for me.

I upgraded to iOS 27 last night; my 15 Pro still has a decently healthy battery which usually lasts all day, charged at 100% starting my day at 6 am, to ~10% at around 11 pm.

Today it’s 3:09 pm and already down at 24%

I have been around for plenty of iOS updates, and I understand a new update is not going to be perfect right off the bat. However, after only 1 1/2 hours of use I'm down almost 40% this morning. I realize this will probably get patched in a future update but the sooner the better, I don't make it through the day any longer without having to charge my phone. My capacity is at 88%, which isn't bad. So, I want to submit my info to try and get a fix for this going asap. My phone finished indexing last week and it hasn't improved the battery life in several days since. It's about the same.

maverick_spartan wrote:

Insane battery drain for my iOS 13 pro.

This is most of all the updates till date.

It’s amazing. I have seen posts almost identical to yours after every update in the past 19 years.

As you haven’t defined “insane battery drain” there’s nothing anyone can say about it. To me “insane battery drain” would mean that the battery is dead one hour after it is fully charged. Is that happening to you?

If you charge the phone overnight with Optimized Charging enabled (a Best Practice) it should not require charging during the day, until the next overnight charging. If it meets this standard then the iPhone is working as designed.

Hello, I recently updated my iPhone to iOS 27 last week, and since the update, I have been experiencing unusually high battery drain. The battery is draining much faster than it did before the update.

Could you please check my iPhone and advise whether this is a software-related issue or if there is any problem with the battery? 

Same. Battery drain is really bad after upgrading my iPhone 15 Pro to iOS 27.

My attempts to fix

• Turned off Siri AI
• Connected to wifi for the day
• When outside kept close to a mobile phone tower at a festival so my iPhone 15 Pro had full connectivity

Battery drain is still really bad.

It is terrible what they did in iPadOS 27, my Pro M2 is draining battery alone with no apps in background and either in flight mode. Optimization finished several days ago.

My battery was lasting days and now cannot get 24 hours without charging.

TE RRI BLE

I’ve been on a holiday on phone all day chilling in the sun max brightness 16 pro max and battery usually between 30-40% with 77% battery health update last night and battery is shocking I’ve had to come in and charge phone was at 20% 3-4hrs before I have been before update yesterday

I tried doing the force restart and gave it some time to see if it improved. My battery life is still rough. My phone was in the red by 12. I charged it and it still didn’t last me through the rest of the evening.

Did you open a support ticket with Apple about your 15 Pro battery drain issue?

I haven't had time to do that yet. There's very clearly an iOS 27 battery issue happening with my 15 Pro Max that did not exist with iOS 26.

I'm having the same issue with my iPhone 17 pro since i have updated to iOS 27. My biggest concern is my phone keep getting Heating even after fully shutdown 😕😕

First 2 days after updating went without an issue. No battery drain, No Heating

But after those 2 days my phone began to heat and drain battery like crazy 😕

I have waited for the iOS 27.0.1 hoping that it would fix the issue. But it didn't either... 😕

I have tried:

1. Factory data reset

2. Turning off siri beta

3. Fresh install iOS via restoring using my MacBook pro

Nothing fixed it yet...

*Only after Turning off wifi completely drops the heat by some amount

My biggest concern is how iPhone keeps getting Heating when it is powered off?? I shutdown my phone before 6 hours of sleeping. Then after waking up i grabbed my phone and noticed it is getting hot even when fully powered off (not powered on yet).

Then after powering my phone on i realized that more than 30% of battery drained during night even when phone was fully shutdown 😕😕

My phone is only just 6 months old. I have another 6 months of apple care warranty. But I'm fron sri lanka we don't have apple stores here. I imported this phone through a reseller by paying 2X the value of the phone

My phone has never dropped. No damages. And no water damages.

I don't know why this happens to my phone 😕

I hope apple will fix my phone with upcoming ios 27.2 🥺 otherwise i will have to ship my phone back to japan and claim apple care warranty. And the process will take about 2 months 😞

After 27.1 update my battery drain one present in every 40 to 50 sec my I phone 13 battery drain so fast please apple fix this before update my iPhone battery working 10 12 hours heavy use please apple fix this as soon as possible

https://one.app.goo.gl/?link=https://one.google.com/home&apn=com.google.android.apps.subscriptions.red&isi=1451784328&ibi=com.google.one&cid=6624482887247220730&_osl=https://one.app.goo.gl/home&_icp=1

I don't think she was attacking the people on here trying to help. She was just expressing her frustration which sounds legitimate to me. I thought I had it bad dealing with the bs Apple repair options but she has a lot of obstacles.

i'm having the same issue with the battery and did everything with Apple support and have even replaced my phone, and this new phone is doing the same thing with overheating and draining the battery and no clear explanation as to why.

I have iPhone 14 Plus and I was highly satisfied with its battery until I upgraded the ios to 27.0 now battery is draining very fast and my battery health also decreased from 87 to 85% in 3 days.

any solution for this or any patch is going to be released soon?

I apparently have another issue with my iphone 16 pro. The battery life of my mobile has improved - i.e it lasts longer after charging. But i am loosing battery capacity/ health rapidly (approx 1% per week) after ios 27 update. It was around 97% at the time of update. It dropped to 95% two weeks back. To 94% last week and 93% this week. There was no change in usage or charging habits and it seems no change in battery life as well. Anybody know what should i do. If it goes like this in a few months it could go easily below 80%😭

Brand new iPhone 18 pro, base config done 3 days ago, then turned off.

Turned on again last night as I got my case and screen protector. Phone has 0 files on it, I do not migrate my contents to a new phone, fresh factory setup.

Last night charged to 90%, this morning was at 47%, 12 hours later, is that normal when the system has no user files to index, no 3rd party apps installed, pure factory out of the box?

Drain yes need battery pack during the day to ensure have enough to back taxi to go home have 15 pro max with be able battery Jan 2026. Leave house 9 am 100% basic use 3 pm 30% left battery capacity now 92%

I’m down to 84 percent after an hour fully charged. Did the update 3 days ago. Charging fully at night. iPhone 15 pro max. This is crazy to want to trade phones because of this. I thought I needed a new battery.

I have tweaked the crap out of my phone.

• BT Off
• Phone in airplane mode with Wifi on
• no eSIM installed yet
• All factory apps
• Clean factory setup, did not carry over from old device
• Powered on for 5 days
• Adaptive power on
• TrueTone off
• Siri Off
• Location services set to only find my...
• display brightness set to about 1/3.
• Always on display off
• lock after 30 seconds
• Fully updated

100% charged and not use at 4:11PM yesterday, this morning, 69%......

So decided to drain out the battery by watching an AppleTV movie..

Results, 2hr movie using 69% of the battery? How are you supposed to get 45hours worth of video watching as per Apples claims on iPhone 18 pro.

Lots of people reporting battery issues on the 18 Pro...



[Edited by Moderator]

Sounds like another "Battery-Gate" like when Apple did those changes to older models claiming it was to "protect the battery" meanwhile they then reverted it due to the backlash, was more like a way to try and force people to buy a new phone :D

But in this case, it is also happening on iPhone 18s....

MBILC wrote:

Sounds like another "Battery-Gate" like when Apple did those changes to older models claiming it was to "protect the battery" meanwhile they then reverted it due to the backlash, was more like a way to try and force people to buy a new phone

It was not to make people buy more phones, and they never reverted it. They just made it clearer in the settings. If your battery's capacity drops too low, your phone will be throttled. And yes, that's to prevent your phone from shutting down suddenly. If iPhones did that, people would blame Apple for "putting them in danger."

I have a 15 pro max, it’s been a while since I’ve updated the phone to iOS27 but the battery drain is still horrible. I cannot blame the indexing here and I don’t know what to do except for keeping my phone on low power mode right from when it’s at 100% to make it work through the day.

My battery recharge and draining was fine until the recent iOS update a week ago! This was supposed to be an upgrade not a downgrade for heaven sake..What used to take just a few hours to fully charge my iPad now takes the entire day this is absurd!

JRT4JUSTICE wrote:

My battery recharge and draining was fine until the recent iOS update a week ago! This was supposed to be an upgrade not a downgrade for heaven sake..What used to take just a few hours to fully charge my iPad now takes the entire day this is absurd!

You should be commenting in the iPad community and not iPhone community. The OS is developed separately and they may have some suggestions that iPhone users may not be aware of. Good luck!

My phone will shutdown even in 58% then when Im back in it goes down 10%. When I run diagnostics, it says i need to replace my battery???? it still 100% Max Capacity🥹, its been like this for 3 days now. I updated to ios 27 last Oct 6. Please help.🥹🥹🥹

[Edited by Moderator]

Still an issue for me. Just updated to the new iOS last night and after a few hours my phone is already half dead when it would be maybe 75% before.

this is ridiculous. Apple is being anti consumer to the extreme

Bueno, me siento en la obligación de decir esto en algún foro y en español. Yo, como propietario de un Macbook Air M5 nuevo, antes tenía la versión iOS 26 y ahora, justo 1 mes después de haber descargado la versión iOS27, me he dado cuenta que la batería se drena en muy pocas horas. Con la versión anterior, viendo YouTube, tendría una autonomía de unos 25-30% cada 3 horas de YouTube a 4K, actualmente, no puedo ver mas de 5 horas viendolo a 1080/4k. La batería pide que le cargue cada dos por tres. Espero que lean los comentarios de la comunidad y arreglen lo antes posible esta versión de m***da. SI TE PASA LO MISMO, DEJAMELO SABER PORFAVOR.

Same issues happen to my iPhone 17 Pro after upgraded to IOS 27.0.1 Since last month (Sept 2026)

The battery drain is insane..

My battery maximum capacity before upgraded was 98%, after less than a month it became 93% now. My battery cycle is 262 only.

I’m upgrading to IOS 27.2, hopefully this issues can be resolved.

otherwise, Apple please fix this immediately!!!

Same here, finally got tired of seeing my phone's performance swamped and change the way that interact with it (like the new timer, Siri extremely slow) happens every single time Apple releases a new version of iOS, Android here i go!

gmancarballo wrote:

Same here, finally got tired of seeing my phone's performance swamped and change the way that interact with it (like the new timer, Siri extremely slow) happens every single time Apple releases a new version of iOS, Android here i go!

Nobody here cares what platform you choose. You can look on the Android Support forum and find those same posts with users who are fed up with their device and buying an iPhone. I would recommend to choose any device that makes you happy even if it is not an iPhone. Good Luck!

After updating to ios 27.2, battery drain is still huge in general mode on my iphone 17

Yet works well for some apps like zee5, hotstar

but for other apps it does not work well

even in idle mode the battery drain is ridiculous

I received an update on my iphone 14 plus about 1.5 months ago and since then it has become a nightmare!

The battery doesn’t even last 6 hours!, which used to support me for the whole day of office work. Understand my habit was charging my phone post lunch when the battery reached around 15-17% and i charged it to 80%, this habit supported my office & personal work calls, AI Chat Bot, and pre-sleep netflix (no gaming). This is how efficient the battery was! I didn’t have to worry about battery even when i travelled from UK to India. But now i am worried the phone will drain even when i am travelling from Mumbai to Vadodara.

Also, it has become another nightmare to find my contacts in the phonebook. Since the update i cannot find my contacts! Even Siri fails to search the contacts sometimes. I have to now go to WhatsApp search the contact -> copy number -> paste in caller -> make the call.

So, @Apple please devise a checklist before you roll out an update for the existing devices such that it doesn’t disturb the established environment of the existing users (users upgrading to new devices change their environment with new device). Let’s understand not everything newly developed is for old systems, old systems can learn and get patched accordingly.

same here. after updating to ios 27 last week, the battery drain is insane. hope this gets fixed by the next update. thank you

I am also facing the same issue i.e. battery draining after the IOS 27 update..

Any new updates - to get it back ??

The same, iPhone 14 Plus, battery 🔋 health is good but draining battery very fast.😲

Insane battery drain for my iOS 13 pro.

This is most of all the updates till date.

Its also happening on iphone 14

Same here. Never had an iOS update drain like this. Updated last week when it came out. Still draining.

I have a 16 PM and battery issues with the iOS 27 update please look into this.

Battery drain problem

Since the iOS 27 update my iPhone 17 pro max the battery drain is massive after a full charge this morning currently 38% left this is horrendous used to last the whole day Apple sort it out

100% having the same issue. Updated to iOS 27 last night and within 2 hours of waking up my battery is on 81%. I hate this

Same issue on iphone 16 pro, battery draining fast, immediately after the upgrade to iOS 27.

My 17 Pro version LL/A after updating to iOS 27 battery drains so fast. And cycle counts too limit 85%, but it’s count 1 cycle after charge 85%.

Battery charge drained to ~60% between 6am and 10am. Same iPhone 15 Pro battery drain pattern each day since upgrading to iOS 27. 45% of a full battery used between 6am and 11:40am.

Don’t worry about saying anything doesn’t work properly on here, we all know IOS27 is a battery hog. You will just get it deleted.

Same here. Mine has been updated at least 6 days now and my battery still drains extremely fast and it already on optimum charging every night.

I even thought my Phone it self had a problem but my battery Health is still 100%. IOS 27 really is draining my battery so much!!!

Me to ???

I have the same issue. I own an iPhone 12 and 12 Pro and the battery life is terrible! Both phones are on 100%. I didn’t have that problem on iOS 26!

My iphone 15 pro do same battery drain ultra fast.

iPhone 15 Pro Max. Battery drain is so severe that I’m having to charge 2-3 times per day…. Same usage, same apps. iOS 27 has an issue. It’s been weeks

This is a perfect example of gaslighting. He was not the only one experiencing this, and it is happening way past the time that an update should be causing it for most of us

💯 lots of gaslighting and rude people in this thread

I do the same. Low Power mode all day. Battery drain has been terrible for over three weeks. iOS 27.01 did not help.

I’ve just bought this phone 1 months before and why am I facing is battery drain issue after ios 27 update

I updated last month. Now ibam facing serious daining issue. Is there any option???

Same here

Thank you!