iphone 12 pro max battery health degrading

It has nothing to do with chronological time. It is “80% is normal after 500 full charge cycles”. A full charge cycle is from 0 to 100% (or combinations that add up to 100% such as 20% to 70% twice). And you should never let it go to 0% intentionally; that WILL shorten the capacity of the battery if it happens frequently. Ideally, charge it when it gets to 20%, and charge it overnight, every night, with Optimized charging enabled.

bishal16 wrote:

I bought my iPhone 12 on the month of November. When i bought it the battery heath was 100% it's been 5months since i am using the iphone but on 30th April 2021 my battery heath is showing 99% why is that showing like this why my battery heath level degraded all of a sudden because i haven't used it so roughly i don't use my iphon 12 while charging I don't charge on regular basis like if it is 60% at night after whole day of use I don't charge theb why this issue ??

i dont evn play games while charging. What should i do?

Every time you charge the phone it loses a little capacity. Every time. Batteries get used up with use. All batteries. That’s why auto supply stores allocate about half their warehouse space to replacement batteries.

For Lithium Ion batteries they will lose about 1% capacity on average for each 25 full charge cycles. But this is an average, and isn’t perfectly linear. Suppose you charge your phone every night, overnight (as you should). It starts the day at 100%. If the phone is at 20% at the end of the day (as an example) that is 0.8 charge cycles a day, or 24 per month. So in this scenario the expected loss of capacity will be 1% per month. If it is lower than 20% at the end of the day, or you charge it during the day, it can drop more than 1% per month. And, of course, if it is higher than 20% at the end of the day the drop will be less than 1% per month.

If you don’t leave the phone on the charger overnight with Optimized Battery Charging enabled your phone will lose capacity faster, because the phone is using the battery 24 hours a day, except for the hour or two or three when you charge it. When the phone is plugged in it is not using the battery; the energy to run the phone comes from the external power source, so if you plug it in overnight for 8-12 hours a day (however long you sleep) it isn’t using the battery during that time.

dzulkarnaen wrote:

Hello my iphone 12pro 512GB batt health drops to 95% yesterday since end of nov2020.

my way of charging it is - i will charge my phone whenever it reach 70% and charge until 100% and will unplug the cable.

i usually never let the batt drops until 50%.

is charging the phone so frequent causing this batt health to degrade?

the batt also drained faster than when it was 100% batt health.

what should i do?

You have made up your own charging protocol that has no basis in reality, and, while it isn’t terrible, it is not optimal either. As I posted earlier:

Thats about what to expect, about a 1% drop per month.

Batteries are consumables; they lose a little capacity every time they are discharged, then recharged. On average this works out to about a 1% loss for every 25 “full charge cycles”. As one example, if you charge the phone overnight, every night (and that is what you should do; it is a best practice), it starts the day at 100%. If it drops to 20% by the end of the day before you charge it again overnight that counts as 0.8 full charge cycles (20% to 100%), or about 24 full charge cycles per month of use. For this example your battery capacity will lose about 1% per month. Of course, if the end-of-day level is higher than 20% the capacity loss will be a little less, and if it is lower than 20%, or you charge it during the day, the capacity loss will be higher.

The absolute best way to improve the life of your battery long term is to enable Optimized Battery Charging (Settings/Battery/Battery Health) and charge the device overnight, every night. The battery will fast charge to 80%, then pause. During the night the phone will use mains power instead of battery power, allowing the battery to “rest”, and thus reducing the need to charge the battery quite as often. The phone will resume charging to reach 100% when you are ready to use your phone; it will “learn” your usage pattern.

I have my iPhone 12 Pro since November 9th - just dropped to 99% on the battery health check on the phone itself. My wife has her 11 Pro for 18 months now and hers is still at 100% (larger battery). I even downloaded a free app to my MacBook called coconut battery. Runs on your Mac only. Plug in phone, trust it in finder and it will tell you many great things about your MacBook Battery and phone. It shows # of charge cycles, who manufactured the battery (mine is SUNWOADA) and what the current max it will charge to versus what the design capacity is. Mine is stating DESIGN CAPACITY: 2815 milliamps. Highest mine will go is 2779 milliamps which technically works out to 98.7% after 57 charge cycles. I traded in my 11 Pro and miss the battery life which was about 400 milliamps larger than the 12 Pro. Not losing sleep over it. I have Apple care and if it drops below 80% before it ends, I will get it replaced for free. Or maybe, just maybe I will upgrade to the 13 and then the 14.

boboGene wrote:

iPhone 12 Pro Max bought on launch day till now. 5% decrease since what November last year? 5% in 6 months that doesn’t seem like good new to me

5% is about right for average use.

Batteries are consumables; they lose a little capacity every time they are discharged, then recharged. On average this works out to about a 1% loss for every 25 “full charge cycles”. As one example, if you charge the phone overnight, every night (and that is what you should do; it is a best practice), it starts the day at 100%. If it drops to 20% by the end of the day before you charge it again overnight that counts as 0.8 full charge cycles (20% to 100%), or about 24 full charge cycles per month of use. For this example your battery capacity will lose about 1% per month. Of course, if the end-of-day level is higher than 20% the capacity loss will be a little less, and if it is lower than 20%, or you charge it during the day, the capacity loss will be higher.

The absolute best way to improve the life of your battery long term is to enable Optimized Battery Charging (Settings/Battery/Battery Health) and charge the device overnight, every night. The battery will fast charge to 80%, then pause. During the night the phone will use mains power instead of battery power, allowing the battery to “rest”, and thus reducing the need to charge the battery quite as often. The phone will resume charging to reach 100% when you are ready to use your phone; it will “learn” your usage pattern.

Update:

I went to the Apple Store had a good talk with the rep and after lots of testing and discussions with other employees the decision was made to replace my phone.

They said they could replace the battery but suspected it was more than that. So if u can, take ur phone in and see what they can do. I was in the store for ant an hour, but it was worth it. There is jst no way the battery health should be dropping so fast on an iphone.

Well, you get lots of recommendations; some are from people who know what they are talking about, others less so.

Your iPhone 12’s battery longevity is unrelated to how you charge it for all practical purposes. While overnight charging is best, there isn’t anything you can do that will significantly affect the decline in maximum capacity of any Lithium chemistry battery; with one exception, even the worst possible practice will only result in minor changes in longevity. The exception is routinely draining the battery to zero, which will kill it much faster, which is why you should charge it when it reaches 20% just to avoid draining it completely.

Batteries are consumables; they lose a little capacity every time they are discharged, then recharged. On average this works out to about a 1% loss for every 25 “full charge cycles”. As one example, if you charge the phone overnight, every night (and that is what you should do; it is a best practice), it starts the day at 100%. If it drops to 20% by the end of the day before you charge it again overnight that counts as 0.8 full charge cycles (20% to 100%), or about 24 full charge cycles per month of use. For this example your battery capacity will lose about 1% per month. Of course, if the end-of-day level is higher than 20% the capacity loss will be a little less, and if it is lower than 20%, or you charge it during the day, the capacity loss will be higher.

Managed to get Genius Bar did a diagnostic test on my phone battery. I was told this kind of abnormal behavior, so they did a factory reset ask me to monitor the health after 5 days dropped 1% again. End up they did a battery replacement for me.

I chatted three times online and went to apple four times.

The online support is the least useful.

One even asked me to switch off 5g, never charge overnight , no fast charge , switch off all notifications, use low power mode, try to use my phone on lesser extent . That’s ridiculous.

To be honest, they cannot do anything as they are restricted by the rules of 80%. They can only replace your battery under three conditions :

1. You pay
2. your mother board has problem, change battery at the same time
3. the senior manager agreed to help and waive your battery after visiting several times with evidence of rapid drop in weeks with few charge cycles .

my case is similar to u: 83 cycles with 92% , 1% drop per 7-10d. They finally replaced my battery under condition 3.

Try to find the manager or shop manager to discuss . That’s what I did . They told me that even 1% drop per month for 12 pro was abnormal , not to say per week. But they needed me to show them that it continued to drop rapidly with data being captured by them .So I attended genius bar for 3 times before they admitted that it was a defective battery . The battery was waived by the shop manager

It's normal, don't worry about it.

(That's not just me saying that, it's Apple.)

If it falls below 80% within one year, Apple will replace it for free.

There is no difference in usage between a battery at 98% health and one at 92% health, so you're literally concerned about a number at this point.

If you are concerned, feel free to contact Apple and see what they have to say, and don't let me dissuade you; the "worst" they can say is that it is indeed normal.

Contact - Official Apple Support

It doesn’t really matter what you consider normal.

Apple, who selected the batteries and designed these phones, expects Battery Health to decline by 1% per month and will replace your battery under warranty if it falls below 80% within one year of purchase.

Worrying about it before then is just needlessly concerning yourself unless your device has reached 80% or is eleven months old.

It is normal; newer phones have more accurate sensors to determine actual battery health and Apple has stated 1% per month is expected.

If your battery health falls to or below 80% within one year of purchase, Apple will replace it for free.

If you still feel your device is failing, reach out to Apple Support directly:

Contact - Official Apple Support

Samuel Maffei wrote:

Losing over 10% charge capacity in less than a year of use is unacceptable for a $1000+ phone.

No, that’s better than average. In normal use the average iPhone will lose about 1% a month in capacity, so it really should have lost 12% in a year.

Batteries are consumables; they lose a little capacity every time they are discharged, then recharged. On average this works out to about a 1% loss for every 25 “full charge cycles” ( some will be a little more, others a little less). As one example, if you charge the phone overnight, every night (and that is what you should do; it is a best practice), it starts the day at 100%. If it drops to 20% by the end of the day before you charge it again overnight that counts as 0.8 full charge cycles (20% to 100%), or about 24 full charge cycles per month of use. For this example your battery capacity will lose about 1% per month. Of course, if the end-of-day level is higher than 20% the capacity loss will be a little less, and if it is lower than 20%, or you charge it during the day, the capacity loss will be higher.

The absolute best way to slow the decline of battery capacity long term is to enable Optimized Battery Charging (Settings/Battery/Battery Health) and charge the device overnight, every night. The battery will fast charge to 80%, then pause. During the nighttime pause the phone will use mains power instead of battery power, allowing the battery to “rest”, and thus reducing the need to charge the battery quite as often. The phone will resume charging to reach 100% when you are ready to use your phone; it will “learn” your usage pattern. If you enable iCloud Backup (Settings/[your name]/iCloud - iCloud Backup) the phone will back up overnight also, assuring that you can never lose more than the current day’s updates.

In support of Apple doing the right thing, my battery was behaving the same way and was down to in the high eighties in terms of charge cycles. It had degraded to 87 % of design capacity. I called AppleCare and explained the situation to them and they agreed to replace my phone. I did an express replacement where they mail you a replacement device and you give them a credit card in case you decided to keep both phones. Once you receive the new phone, you have 8 days approximately to return the defective device to them in the box they provide with free shipping via FedEx and they don't bill you for the phone at that point.

Everyone's results will vary but they did say that (after reviewing the log files) that after that many charge cycles - it wasn't going to suddenly stop and get better. I was very polite, explained the situation and I now have a 12 Pro with a battery that shows the design capacity being 2815 milliamps but mine is reading 2928 milliamps so it does show my battery to be at 104% right now.