Battery Health Capacity Dropped

I reported the same issue on here in February. Battery health suddenly started to drop. After some wise words from fellow members i simply ignored it. Used my device as per usual and the only change i made was use 5w charger only. Since February battery health stayed stable at 97% even though coconut and imazing were showing higher values. In between ive been running 13.4 and 13.5 betas. Today i decided to dfu restore my device as system storage under others was showing very high value and also i wanted to save blobs before i jailbroke my device. So i erased my phone and dfu restore my device to 13.5 and then restored from iCloud back up. Checked my battery health and it up back to 100% and is in line with coconut readings. Only explanation i can give is it could be an iOS glitch. Im sure members on here are more knowledgeable than me regarding batteries.

Use a 5 watt power adapter if you aren’t already. The 18 watt fast charger should not be used on a consistent basis and avoid wireless charging. My 11 pro max is still at 100% after 7 months of use.

So Apple has addressed battery concerns in iOS 14.5 upgrade. Claims 14.5 will recalibrate the battery in iPhone 11 variants.

I'm trying to remain respectful, but most of what I've read about in this thread is within what is reasonable for battery decline. Apple says 500 cycles to 80%, and a loss of 1% per month is well within that. There can be a variation too, where some decline faster and some decline slower. 97% after 2 months isn't really all that unusual. The decline is not guaranteed to be a straight line either.

Apple was hesitant to actually bring out the Battery Health feature because of worries that users would become battery hypochondriacs worried if "losing 1%" was normal or who might compare theirs to that of friends and family. It's normal. Just relax and enjoy your iPhones. If it comes time to do it, changing the battery is pretty easy and only a fraction of the cost of an iPhone.

Mac_slide wrote:

don't worry about what the numbers say

if it's not at 80 and below nothing will be done unless you spend the cash

I've had battery drop very fast first few months, even to 82% before - lasted for years until hit really died

I've had battery stay at 98% the whole life from new and die a few years later at 98% while apple was telling me my battery was fine.

If you get the hours you expect - don't worry about what that says

Apple has made it known what their battery design goals are. I've had some devices that I got that were under 100% but I knew there wasn't much I could do about it. I've also had the battery that wouldn't die no matter what I threw at it.

Yet many still persist that because "I saw this before" or "my brother's did better" that a steady decline in line with Apple's published specifications (80% after 500 cycles) is somehow wrong or they've been cheated - just because they didn't see that better than average performance.

Honestly we're kind of spoiled these days. I remember the days when a lithium rechargeable battery was expected to last 200-300 cycles before a decline to 80%. We're at a rated 500 to 1000 cycles for all Apple devices now. I suppose they could probably increase it by "overprovisioning" the battery capacity where less of its charge range is used. That's likely how larger Apple device batteries are rated for 1000 cycles.

yusufslama wrote:

My iPhone 11 pro I got it at the end of October and two months later it’s 99%

it’s just one percent but I’m so worried for the long run

There's nothing to be worried about. What you're seeing is normal. Unless you're having a problem with your phone, there's no reason to check Battery Health again until late August. Check it and, if it's at 80%, get it replaced while the phone is under warranty. If it's close, watch it so that, if it drops to 80% as you near the end of your warranty, you can get it replaced.

There's no real reason to keep checking it if your phone is behaving normally.

Call Apple and ask them to do a remote diagnostic on your phone. That will tell them if the battery has a problem or not. They will look a your battery charge cycle count and tell you if it is normal or not.

mmx166 wrote:

Today apple service call to me, he run diagnostic test, he say yes you have 99% its very ok, why? beacouse this is first run of iPhone and he can dropes 1-2% battery!

He says when battery droped to 95% you can drive to service..

I have 11 cycle.. ;(

Apple won't replace the battery until it drops below 80%.

jeward wrote:

I encountered the same to, I am using my iphone 11 pro max for 1 month and 6 days now..yesterday it was 99% i contacted apple support and they said its completely normal and does not have any hardware malfunctions today when i check it, it is now running under 98% battery capacity..

Yes, it's completely normal. There's no reason to be checking Battery Health unless your phone isn't running properly or your near the end of your warranty. Stop looking at it and stop worrying about something that isn't a problem.

I would agree with you. The biggest killer is rapid charging without cooling the phone. The Battery Management System in any modern phone, should take care of extreme cycles, and if the phone is showing a 100%, the actual is more like 90-95%, same with discharge.

During rapid charging, the battery warms up, and lithium spikes are formed internally which eventually can penetrate the insulation within the battery and cause a short.

Allowing the phone to discharge to what the BMS considers 0%, then charging up to what it considers to be 100%, will, depending on the phone and battery, reprogram the 0% to 100% calibration, without actually changing the "real" capacity of the battery. Battery "health" or life span is theoretical, as it depends to a large extent to cycles and charge/discharge rate and temperature variations the battery is subjected to.

Personally, I use a low charge current, but if I need to rapid charge, I do it over a purpose built cooling fan assembly which I use for other Lithium based batteries in electronics.

Yes, the algorithm has changed in the battery app, the battery has changed, and the app is not linear and can be affected by an assortment of variables.

Here is the important part: Is you iPhone working correctly? If yes, quit checking it so often. Check it again about 2 months before your warranty expires.

jaskirat97 wrote:

1. Dear that’s very terrible because i m using iphone 11 pro max from approx 3 and half month and my battery health just decrease by 1% today now it is on 99% . That is very terrible to know about your battery health .

There's nothing "terrible" about it. It's normal.

You should take care of you cellphone carefully by adopting some appropriate methods like -

do not use phone while charging

do not get you phone very cold or hot

charge with original charger

charge upto 80% and adopt 40 80 % rule of charging your iphone .

Using the phone while it is charging will not hurt it. Made for iPhone certified chargers are perfectly acceptable.

I had a similar issue but further down the road. I've had my 11 Pro Max since launch and it is down to 98% as well. I think part of this though comes from actual usage though and not necessarily how the device is charged. If you frequently utilize battery intensive apps or spend a lot of time gaming on your device, it can tax the battery a little more than just basic usage. Lithium-ion batteries function a little bit differently due to composition and materials though. Once upon a time it was heavily pushed that ideal charging or not charging past 80% would allow the battery to last longer, that isn't really the case anymore. Typical usage after one year should be right around 98-99% but again it can vary based on usage.

Techguy1985 wrote:

I think it is well known that over time, batteries will decrease in capacity. The concern here, to my understanding, is that it appears to be decreasing a little faster than what may be considered normal. There are several factors to consider outside of daily usage. There could be an app draining the battery and diminishing the battery. Best bet is to have the device checked and see if there is anything abnormal going on in the background that could be causing it to happen.

Yeah - but a lot of people come in posting questions expecting that they'll get a new battery or perhaps even a new phone. The primary issue is that Apple doesn't really consider the rate of loss of capacity to be anything that can be addressed by the warranty. It's a single number - 80% battery health before the warranty or AppleCare+ expires. Report after report of people going to Apple or an AASP with complaints about the battery health declining too quickly and being told there's nothing that can be done under warranty unless it's under 80%.

The biggest complaint here is that "I saw my iPhone 6s" last 3 years at 95% battery health" (much better than the design specs), and then get upset because the decline in battery health of their new (completely different device) is in line with the design specs.

You do know that the battery health algorithm is not linear? You could be at 83% on your 11 pro in 4 years. Why not quit making yourself miserable, check the battery health again in 3 - 4 months and if it is at 83% use your warranty to replace it?