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... This weekend, I had 95% on the iPhone battery then had to use an app to configure WiFi hardware. After an hour of this, battery was at 70%. Then I tried FaceTime for 15 minutes... battery warning came up at 10%... got to 8% remaining when FaceTime was ended (total 15 minutes, with max WiFi bars/signal). iCloud syncs 1Password and email on iPhone but none were obviously open/accessed during this.
Are you sure that your battery is good? We had an iPhone 5S that seemed to have a good battery but would drop quickly after some usage. The test at the Apple Store did say the battery was defective, even when some outside tools did not.
 


I am using iPhone 7 with iOS 12.1.4 installed in Japan, and I have been experiencing a huge battery drain recently (for a week or so?). I thought the battery was dying, but I am glad that I came across this thread. Turning off iCloud defeats the purpose of my owning an iPhone, so I hope Apple will come up with a solution soon.
 


I would second the idea of signing in using a different iCloud account. Maybe the best would be to create a new test account (for testing only, don't get caught with the problem of buying things with two different accounts). I think you mentioned you have an Apple Watch. Initially at least don't let the two talk to each other. I did scroll back to your first post on this issue and see that you did an "install as new phone" procedure. You might consider doing this again when you activate your test account.
I might give this a go - as a last resort - but it won’t be until next week.
 


In my quest to find the battery drain culprit, I have a some questions:
  • Why does Reminders appears twice in iCloud settings? On both my iPad and iPhone (12.1.4) Reminders appears under both 'Apps Using iCloud' and 'iCloud Drive'.
  • Why would Maps appear on the iPad under 'iCloud Drive' but not at all on the iPhone when both have the app installed? For comparison, of the default apps, Books appears on both devices.
  • Why would the Google Drive and Microsoft OneDrive apps need to access iCloud Drive?
I have reached an impasse with this. Logging out of iCloud improves battery life massively. Logging in again restores the fast drain.

When logged in, no combination of apps or services on/off makes much difference to the speed of drain. As I said before, none of the radio on/off combinations makeS any difference.
...
It would be very interesting to know if anyone else here who has an iPhone 6S and has battery problems finds that logging out of iCloud resolves them.
I cannot answer your questions regarding apps checked in iCloud (and iCloud Drive). However, I have an iPhone SE that experienced the quick battery drain on two consecutive days as you've described . That is, I fully charged the iPhone, went to sleep, and the next morning the battery was "red low" without any usage throughout the night.

I, too, found a number of the same apps checked for iCloud and iCloud Drive. I turned the duplicates, as well as other apps, off under iCloud Drive. Since I only occasionally use Pages, I turned iCloud Drive off. I rebooted the iPhone twice, fully charged it, went to sleep, and the next morning the battery icon looked full.

The only thing that was different on those days is that I used a new USB car charger to charge my phone while driving. (Since upgrading to iOS 12.x, the Y-cable (USB and Aux) for my car no longer charges the phone, even after attempts to re-bless the USB port and other "remedies" to no avail.) Subsequently, I charged the phone at home on AC. I wonder if the new USB charger didn't terminate properly when the phone was unplugged, and thus, the iPhone tried to backup to iCloud (as if plugged-in).

Note: My iPad Pro 11" battery is fine with iCloud Drive on. I'll be paying attention after the next time I charge the phone with the new USB car charger.

So, Bernard, if you have not already done so, consider turning off iCloud Drive only.
 


I too find that my iPhone 6S will completely drain within half a day following the upgrade to iOS 12.1.4. I have not tried turning off iCloud. However, I find that using the battery setting Low Power Mode eliminates the battery drain with no ill effects.
 


... The only thing that was different on those days is that I used a new USB car charger to charge my phone while driving. (Since upgrading to iOS 12.x, the Y-cable (USB and Aux) for my car no longer charges the phone, even after attempts to re-bless the USB port and other "remedies" to no avail.) Subsequently, I charged the phone at home on AC. I wonder if the new USB charger didn't terminate properly when the phone was unplugged, and thus, the iPhone tried to backup to iCloud (as if plugged-in).

Note: My iPad Pro 11" battery is fine with iCloud Drive on. I'll be paying attention after the next time I charge the phone with the new USB car charger.

So, Bernard, if you have not already done so, consider turning off iCloud Drive only.
Since upgrading to iOS 12.x, I, too, have found my iPhone 7+ won't charge in virtually every third-party device (which includes a powered Transcend USB hub). I have to use an Apple-branded wall adapter or plug directly into a Mac computer. I don't know about PCs.
 



I too find that my iPhone 6S will completely drain within half a day following the upgrade to iOS 12.1.4. I have not tried turning off iCloud. However, I find that using the battery setting Low Power Mode eliminates the battery drain with no ill effects.
This morning, I watched as my iPhone 6s battery went from 100% to 60% in about 24 minutes doing nothing but reading Facebook posts and stories on the web. This iPhone had its battery replaced in late 2016 for free under Apple's battery replacement program. It now shows a maximum capacity of 84%. I guess after 2.5 years these batteries go. Very annoying, but I'm still not ready to shell out $1000 for a new phone yet.
 


I had a similar problem with fast and steep battery drain, even after Apple put in a new battery into my iPhone 6S.

I backed up the iPhone to my Mac, and then installed a fresh iOS. Problem solved. Something in my configuration was either eating the battery or indicating the the battery was low.

I then restored from the backup, and the problem did not come back.
 


I missed the very last update to iOS 10 before 11 came out, so here I sit at 10.3.1 on an iPhone SE. Is iOS 12 "fixed" yet? Security aside, is it safe to come outside?
 


I missed the very last update to iOS 10 before 11 came out, so here I sit at 10.3.1 on an iPhone SE. Is iOS 12 "fixed" yet? Security aside, is it safe to come outside?
Soon, iOS 12.2 will be released, then [maybe] it'll be safe [because] I found that when too many incremental updates are done, there may be a glitch in the iOS that's installed. In some cases, I resorted to doing a restore operation.
 


I missed the very last update to iOS 10 before 11 came out, so here I sit at 10.3.1 on an iPhone SE. Is iOS 12 "fixed" yet? Security aside, is it safe to come outside?
To be fair, it hasn't messed up everybody. I've been running the latest iOS for some time (I usually upgrade 1-2 weeks after a release, just to make sure there isn't a complete system-killing disaster of a bug) on my iPhone 6+. I haven't encountered any problems to-date.
 


Have you tried turning USB Restricted Mode off?
I tried USB Restricted Mode off and on several different times to no avail with my third-party cables (mini Y-cable and Lightning-to-USB) with the car's USB port and the new USB car charger that the TidBits article notes: "Apple acknowleges this problem."

I'll try to remember to take an Apple cable to use with the USB car charger the next time I use my car.
 


So, Bernard, if you have not already done so, consider turning off iCloud Drive only.
I have tried every combination of iCloud services on and off - alone and with others - including iCloud Drive. None made any significant difference, whereas iCloud off or on definitely did change the speed of battery drain.

Frankly, I have given up hoping for a fix with the current iOS release. I'm hoping - since Apple has now stopped responding to me about my "Executive Relations" case - that there's a known issue that will be fixed by a subsequent release. Apple has form for this kind of secretive approach to problem solving.
 


Ric Ford

MacInTouch
I have tried every combination of iCloud services on and off - alone and with others - including iCloud Drive. None made any significant difference, whereas iCloud off or on definitely did change the speed of battery drain.
Hmmm. I wonder what data Apple is transferring that's not listed under any of its services?
 


I likewise have noticed significant battery drain with the most minor of iCloud connections, resolved completely when I turn iCloud completely off.
 


(Since upgrading to iOS 12.x, the Y-cable (USB and Aux) for my car no longer charges the phone, even after attempts to re-bless the USB port and other "remedies" to no avail.)
Since upgrading to iOS 12.x, I, too, have found my iPhone 7+ won't charge in virtually every third-party device (which includes a powered Transcend USB hub). I have to use an Apple-branded wall adapter or plug directly into a Mac computer. I don't know about PCs.
I tried USB Restricted Mode off and on several different times to no avail with my third-party cables (MINI Y-cable and Lightning-to-USB) with the car's USB port and the new USB car charger that the TidBits article notes: "Apple acknowleges this problem."

I'll try to remember to take an Apple cable to use with the USB car charger the next time I use my car.
I took my car for servicing and asked the owner to check my car's USB port. One service tech had an iPhone with the latest iOS 12.1.4 and his phone would not charge. Another tech had an iPhone with an older iOS (possibly 10.x) and his phone charged. Note that the tests were with my car's Y-cable.

The results concur with my experience, i.e., iPhone with iOS 10.3 charged on 12/25/2018 and after updating to iOS 12.1.2 on 12/27/2018, the iPhone no longer charges with the Y-cable for my car. Not my imagination.
 


Last Friday I went out with about 65% on my 6s. I made a call and was on the phone for about 20 minutes, then ended it as another call came in. The phone went dead and would not restart until I got back to the hotel and plugged it in. After 15 mins it was at 73%.

I spent the rest of the weekend with the phone in Low Power mode and had no further problems. (Apart from having to set it into LP mode after every charge). Why can’t LP mode be normal and the High Drain, Crash your Phone mode be chosen by the user?
 


Last Friday I went out with about 65% on my 6s. I made a call and was on the phone for about 20 minutes, then ended it as another call came in. The phone went dead and would not restart until I got back to the hotel and plugged it in. After 15 mins it was at 73%. I spent the rest of the weekend with the phone in Low Power mode and had no further problems. (Apart from having to set it into LP mode after every charge). Why can’t LP mode be normal and the High Drain, Crash your Phone mode be chosen by the user?
Yesterday, making no calls on my iPhone 6S+, at 5pm, it was at 43%. I did a reset (hold power + home/touch button), the phone came back up and was at... 72% battery.

By 10pm, it was down to 60%. Again, no calls. I had no apps open. Just normal Bluetooth/WiFi active. Max capacity still at 91%.

Peak Performance Capacity always shows "This iPhone has experienced an unexpected shutdown because the battery was unable to deliver the necessary peak power. Performance management has been applied to help prevent this from happening again. Disable..."

Clicking the Disable link has a pop-up, "Disabling May Lead to Unexpected Shutdowns. Disable or Leave on"

I am setting it to Low Power Mode until 5pm to see if it makes any difference.
 



Yesterday, making no calls on my iPhone 6S+, at 5pm, it was at 43%. I did a reset (hold power + home/touch button), the phone came back up and was at... 72% battery.

By 10pm, it was down to 60%. Again, no calls. I had no apps open. Just normal Bluetooth/WiFi active. Max capacity still at 91%.

Peak Performance Capacity always shows "This iPhone has experienced an unexpected shutdown because the battery was unable to deliver the necessary peak power.
The first question I would ask is, how old is the battery? I have the previous model, the 6 Plus. Just this past December, I had a sudden marked decrease in my charging capacity and battery power, though it never died, though it did do weird things like register 38% when I turned the phone off, only to drop immediately to 33% when I turned it back on. At no time did Peak Performance Capability ever display anything other than "Your battery is currently supporting normal peak performance."

Apple nonetheless diagnosed the battery as having failed and promptly replaced it. Problem solved.

With your combination of symptoms, your battery seems like a prime candidate for replacement. I really don't think any settings change you can make is likely to fix what you're experiencing.
 


The phone went dead and would not restart until I got back to the hotel and plugged it in...Why can’t LP mode be normal and the High Drain, Crash your Phone mode be chosen by the user?
Here, too, I would wonder about the age and/or condition of your battery, despite anything Apple's Battery Health metrics might say. The "high drain" mode shouldn't crash your phone in the absence of a worn out or otherwise malfunctioning battery.
 


Here, too, I would wonder about the age and/or condition of your battery, despite anything Apple's Battery Health metrics might say. The "high drain" mode shouldn't crash your phone in the absence of a worn out or otherwise malfunctioning battery.
Interesting thought, but, it is on its second battery - the first was replaced under the recall, and when I was first having problems (December), I took it in, and Apple refused to do anything with it, saying it was behaving normally.
 


Yesterday, making no calls on my iPhone 6S+, at 5pm, it was at 43%. I did a reset (hold power + home/touch button), the phone came back up and was at... 72% battery.
By 10pm, it was down to 60%. Again, no calls. I had no apps open. Just normal Bluetooth/WiFi active. Max capacity still at 91%.
Peak Performance Capacity always shows "This iPhone has experienced an unexpected shutdown because the battery was unable to deliver the necessary peak power. Performance management has been applied to help prevent this from happening again. Disable..."
Clicking the Disable link has a pop-up, "Disabling May Lead to Unexpected Shutdowns. Disable or Leave on"
I am setting it to Low Power Mode until 5pm to see if it makes any difference.
An iPhone 5S behaved the same way. A battery change-out fixed the problem. I am not sure that the battery capacity percent value is sufficient to indicate total battery performance under load.
 


Not entirely related, but similar: I have a 2017 10-inch iPad Pro. Lovely thing - used it all the time. About 6 weeks ago the battery started draining quickly (doing nothing, discharging in 6 hours or so).

I ran CoconutBattery, which said 78% capacity (orange). I took it into an Apple Store in Bluewater and got someone to take a look. She ran their diagnostics and said the battery was fine - according to them, 91% capacity, And what I should do is a wipe and reinstall. I told her I had done that, showed her my tests, and she said she'd be back in 5 minutes. Came back in 5 minutes with a new identical iPad Pro. I wiped the old one, thanked her very much and took the new one.

Did an install using the backup I'd made that morning. But for the past 2 weeks I've seen the same behaviour.... Thought it might be Clash of Clans, so removed that. Still a problem. Siri was using a lot of battery the first week but now seems to have finished its jiggery pockery, and still discharging quickly. On airplane mode, the battery doesn't run down, but if connected by wifi, or 4G, or both, it does. Bluetooth off, still draining quickly. Any ideas?
 


Ric Ford

MacInTouch
This may be obvious, and it doesn't solve the problems being discussed, but for what it's worth, I'll just note how helpful it can be to give an iPhone a little extra charge during the day, which can be facilitated by two things in my experience:
  • using a power supply with ample current, e.g. an iPad charger or high-powered outlet, dock port, or car adapter
  • a long Lightning-USB cable that allows more convenient use of the iPhone while it's plugged in (e.g. Amazon Basics cords, which have been working fine for me and come in multiple colors)
 


This may be obvious, and doesn't solve the problems being discussed, but for what it's worth, I'll just note how helpful it can be to give an iPhone a little extra charge during the day, which can be facilitated by two things in my experience:
  • using a power supply with ample current, e.g. an iPad charger or high-powered outlet, dock port, or car adapter
  • a long Lightning-USB cable that allows more convenient use of the iPhone while it's plugged in (e.g. Amazon Basics cords, which have been working fine for me and come in multiple colors)
I have a 10-foot charging cord for traveling. It is handy, especially in older motels and hotels that do no have enough receptacles for the 'age of devices' (and what receptacles they do have are often in very inconvenient locations).
 


I have a 10-foot charging cord for traveling. It is handy, especially in older motels and hotels that do no have enough receptacles...
I usually travel with a 12-outlet power strip. Between myself and my wife, we often use most of them (two laptops, iPad, three phones, iPod, iPod touch, camera, Kindle, Apple Watch).
 


... I have a 2017 10-inch iPad Pro. ... About 6 weeks ago the battery started draining quickly (doing nothing, discharging in 6 hours or so). ...I took it into an Apple Store in Bluewater and got someone to take a look. ... Came back in 5 minutes with a new identical iPad Pro. I wiped the old one ...
Did an install using the backup I'd made that morning. But for the past 2 weeks I've seen the same behaviour.... Thought it might be Clash of Clans, so removed that. Still a problem. Siri was using a lot of battery the first week but now seems to have finished its jiggery pockery, and still discharging quickly. On airplane mode, the battery doesn't run down, but if connected by wifi, or 4G, or both, it does. Bluetooth off, still draining quickly. Any ideas?
If you are using iCloud, check which apps are using iCloud and try turning some off. Also, do you use iCloud Backup? If it is "on" try turning it "off" and see if that helps.
 


This may be obvious, and it doesn't solve the problems being discussed, but for what it's worth, I'll just note how helpful it can be to give an iPhone a little extra charge during the day, which can be facilitated by two things in my experience:
  • using a power supply with ample current, e.g. an iPad charger or high-powered outlet, dock port, or car adapter
  • a long Lightning-USB cable that allows more convenient use of the iPhone while it's plugged in (e.g. Amazon Basics cords, which have been working fine for me and come in multiple colors)
Within 2 months of getting my iPad Air (circa 2013), I bought a 10-foot Lightning-USB cable. I generally use the iPad Air charger to charge my iPhone. Thanks, Ric, as your post reminds me that I need to buy a long USB-C to USB-C cable for my iPad Pro 11".
 


If you are using iCloud, check which apps are using iCloud and try turning some off. Also, do you use iCloud Backup? If it is "on" try turning it "off" and see if that helps.
Thanks for the advice, but no, that's not it.... I think it’s something related to being on the internet, because airplane mode was on overnight and the battery hardly discharged at all. If it is not on airplane mode, it goes from 100 to 0 percent overnight.
 


I usually travel with a 12-outlet power strip. Between myself and my wife, we often use most of them (two laptops, iPad, three phones, iPod, iPod touch, camera, Kindle, Apple Watch).
The most important accessory in my travel kit is a 4.5" x 4.75" rectangular pad that converts a standard 2-outlet a/c receptacle into a 3-outlet receptacle that also contains a row of 4 standard USB type A receptacles that will deliver a maximum of 4.2A (shared). I can charge my cordless Beats X in-ear headphones, my iPhone, my iPad, one other device, and my Netgear Nighthawk cellular router simultaneously and still have the same two vacant a/c receptacles I started with. Here's the link:

 


I usually travel with a 12-outlet power strip. Between myself and my wife, we often use most of them (two laptops, iPad, three phones, iPod, iPod touch, camera, Kindle, Apple Watch).
I have a Griffin block plug-in that on the other end is USB. I can charge my iPhone easily. As as I have said before, I also use Unu portable chargers. They charge up the iPhone in the same way as when it is plugged in. The only downside is it take longer to recharge, but I have two of them and think that will resolve the problem when I fly.
 


... no, that's not it.... I think it’s something related to being on the internet, because airplane mode was on overnight and the battery hardly discharged at all. If it is not on airplane mode, it goes from 100 to 0 percent overnight.
Based on your description, when your device is in "airplane mode" your device cannot access the Internet via WiFi or cellular. That's why it does not drain the battery.

When a user turns Airplane Mode "On" it turns "Off" the device's (iPhone/iPad) connection to all wireless networks, including cellular and Wi-Fi. In addition, Bluetooth, GPS, and other related services are "Off". That means that apps or services that require Internet or related services will not work. iCloud, its apps, iCloud Drive and other apps such as Safari require an active Internet connection. See iCloud system requirements.

If you have not been following this thread, consider reading the posts by Bernard H (#79 starting February 6, 2019) with a similar "perplexing problem" with his iPhone and responses by other forum members.
 


... I have a 2017 10-inch iPad Pro. ... About 6 weeks ago the battery started draining quickly (doing nothing, discharging in 6 hours or so).
... Apple Store in Bluewater and got someone to take a look. She ran their diagnostics and said the battery was fine - ... And what I should do is a wipe and reinstall. I told her I had done that, showed her my tests, and she said she'd be back in 5 minutes ... with a new identical iPad Pro. I wiped the old one...
... Did an install using the backup I'd made that morning. But for the past 2 weeks I've seen the same behaviour.... Thought it might be Clash of Clans, so removed that. Still a problem. ... and still discharging quickly. On airplane mode, the battery doesn't run down, but if connected by wifi, or 4G, or both, it does. Bluetooth off, still draining quickly. Any ideas?
Did you use a backup when you performed the "wipe and reinstall" before going to the Apple Store? If yes, then it seems that the culprit is in your backup, since you used a backup in setting up the new iPad.

If checking for rogue apps you use that have iCloud access and any apps that back up to iCloud Drive (as I suggested before) is not something you want to investigate, then you might consider erasing your iPad and setting up as new (to avoid the culprit that is in your backup).
 


Based on your description, when your device is in "airplane mode" your device cannot access the Internet via WiFi or cellular. That's why it does not drain the battery.

When a.....See iCloud system requirements.

If ...forum members.
Thanks for taking the time to reply, but it's not quite what I'm asking. The question is, 'why does the battery in a new iPad drain very fast except when airplane mode is on?'

It's not inherent to the machine as it retains battery when airplane mode is on. But when connected to the internet it does. (I haven't done the experiment yet with bluetooth off but 4G and wireless on to be honest though, so it could possible be bluetooth)
 


Ric Ford

MacInTouch
Thanks for taking the time to reply, but it's not quite what I'm asking. The question is, 'why does the battery in a new iPad drain very fast except when airplane mode is on?'...
As LilLC mentioned, there's a lot of good information in the postings above, but to answer your specific question, wireless Internet access requires a radio in the iPhone that includes a transmitter, and that draws power, draining your battery at variable rates, depending on things such as signal strength.

As one example, you may find that your iPhone battery level drops quite rapidly while on a hike in an area with poor cellphone coverage, as the iPhone maximizes transmitter power in its straining attempts to connect to a cell tower. Enabling airplane mode can turn off the radio and thus save power and battery drain.
 


As LilLC mentioned, ... thus save power and battery drain.
Thanks.

Continuing to experiment. Wiped the new (from Apple 2 weeks ago) 2017 iPad Pro 10" A1709, 4G.

Wiped the machine and reinstalled iOS 12.2 fresh. Didn't install anything else, removed a few Apple apps. iCloud Drive is off, iCloud Backup is off, any kind of Photo sharing is off, it is using iCloud for Mail, Contacts, Calendar, Messages, Safari, Game Center, Keychain and Find My iPad but as far as I know nothing else. It isn't listening for Hey Siri or Press Home for Siri. The only use of Siri is 'Suggestions in Search' and each app has 'Show App' but not 'Siri and Suggestions'. I can't think what else to turn off and still be able to reasonably use it.

Overnight it went from 74% to 0% in 6 hours with me not touching it (screen off). Wifi was on but 4G and bluetooth were off.

For comparison I also have a newer (2018, A1934) 4G iPad Pro 10" with iCloud Drive on, listening for hey Siri, all Photo sharing stuff off, and various apps. It was used yesterday for 1.5 hours for some games, reading a newspaper, email, and a tv episode and left overnight with Wifi, Bluetooth, 4G all on. Went from 76% to 48% in 22 hours.

The 2017 iPad doesn't drain the battery if airplane mode is on, but that rather takes away the point of the device. I'm at a loss....
 


Ric Ford

MacInTouch
... Overnight it went from 74% to 0% in 6 hours with me not touching it (screen off). Wifi was on but 4G and bluetooth were off....
For comparison, I have a 16GB iPad Air (recently updated to iOS 12.2) that goes for days with WiFi and Bluetooth turned on and the battery not draining. iCloud is turned off. (An Apple ID is signed in.)
 


If you are using iCloud, check which apps are using iCloud and try turning some off. Also, do you use iCloud Backup? If it is "on" try turning it "off" and see if that helps.
I've been whining here about the battery drain on my iPhone XS Max since I bought the device. Used to go from a 100% charge to about 70% overnight with nothing on. Sometimes it would drop to less than a 70% charge, still with nothing on.

I updated to iOS 12.2 and, voila, overnight - and with the same settings - it goes from a 100% charge to between 92-98%! Happy!
 


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