13 pro max battery showing 99% after two month

J325is wrote:

My iPhone 13 pro max is at 89% battery health after 4.5 months. I do use the wireless charger dock at night. This may have something to do with the quick battery degradation.

No, how you charge it doesn’t have anything to do with it. I use a wireless charger dock every night, and I have for over 3 years. My battery health is 94%. It’s more likely that your battery is defective; after 4.5 months it would be expected to be over 96% in normal use. Use the Contact Support link to have it checked by Apple.

You’re doing fine; 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 get maximum use on a charge, as well as 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.

I contacted apple tech support and they ran a remote diagnostic on my phone. They said that since the battery is above 80% health that it doesn’t qualify for a repair. “The battery is a consumable item etc” I explained that I’ve never seen one drop so quickly. The rep said they couldn’t do anything at this point.

Reposting what is already posted on the previous page:

You’re doing fine; 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 get maximum use on a charge, as well as 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.

There is no point in worrying. When it reaches 80% have Apple replace the battery. If it happens in warranty it will be free. Out of warranty (or out of AppleCare+ if you purchased it and didn’t extend it at the end of 2 years) it will cost $69. As I said, with average usage it will lose around 1% a month, so 97% after 3 months is right on target. As it is a deteriorating chemical process that slowly consumes its electrodes it won’t be linear. It only drops in whole percentage points, and the algorithm truncates rather than rounds, so a drop of 98.0% to 97.9% will display as a drop from 98% to 97%, even though it only dropped 0.1%.

Thank you Lawrence, I really appreciate your knowledge and guidance you provide on this forum. I'll wait and check my battery till the warranty period that's December last week. If it goes to 80% by then or after that I'll do the needful accordingly. Thanks again.

three months ago I did an upgrade from iPhone XR to iPhone 12 Pro and the battery health from the previous iPhone it’s still in 92% with three years of using what I did to preserve my iPhone’s battery condition ? Well since day one with the iPhone XR I get a apple Smart Battery Case that gives charge to the internal battery and stays in 100% every day and when I need to charge it will charging the Smart Battery Case only so sometimes we need to invest some of money to do things right

Batteries are chemical processes, and are not all identical. Apple’s specs say the battery should stay above 80% for 500 full charge cycles, but it doesn’t say no more than 500 full charge cycles. So through manufacturing variability some batteries will do better than the minimum specification. There isn’t anything specific you can do, other that follow best practices that I have previously posted, but here it is again:

The absolute best way to get maximum use on a charge, as well as 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.

Hey me too! My gf and I bought ours day one when the 13 pro max was released. She’s at 99% and I’m still at 100% I don’t know why though, I do use my phone more than she does. Luck of the draw I guess. 7 month club!

porwalsp wrote:

I have purchased iphone 13 in sep and it’s battery health dropped to 99% today. So it took 7.5 months for me.

You have an exceptionally good battery, although see what it does from here. Keep in mind that a battery is a chemical device, and chemistry is generally pretty variable and uncertain, as well as being analog, not digital. Apple specs the battery capacity to remain above 80% for 500 full charge cycles, but that is a minimum requirement; there is no published maximum expected capacity. So sometimes batteries will perform much better than that minimum specification, and sometimes the change in maximum capacity won't be linear. 

All iPhones have a specification for the battery. For example, for the XS Max that is 3174 milliampere-hours (MaH). So the battery monitor is calibrated for 100% at that value. But there are variations in manufacturing, so some batteries will have less capacity, and some will have more. Suppose your battery had, say, 3474 MaH capacity (10% over standard). That would still show as 100% (even though it was actually 110%), but as it aged the health would stay at 100% until it fell below 3174 MaH. This would appear to you as if your battery had fabulous life. 

anshul138 wrote:

Same for my 13 pro max model brought it on 31 Jan 2022

and BH now showing as 99% after 2 month but still getting awesome battery life

the reason of this sudden fall is weather here in india

It isn’t a “sudden fall”. On average a battery will lose about 1% a month. Some phones will do better, but that’s about right for your phone. Scroll up and read my long post.

Like I had posted earlier in April, worrying about my sudden fall in battery health to 97% within a span of 15 days, now my battery is still at 97% like it was in April....so like 6 months for my phone since December and 3% drop is good. Strange but now it feels good.

UPDATE: I bought my iPhone 13 pro Max on September 24th 2021. To this day my battery health is still showing 100% This phone is something else to go 9 months “without degrading”. Obviously the battery is degrading but for some reason the software deems it at 100% capacity. Just thought I’d let everyone know.

That is nothing to be concerned with. As a matter of fact, your device is doing quite well if you have only seen a 1% reduction after 7 months. Normal reduction would be a little higher. There is nothing to worry about with your device, so the emoji with a tear is not necessary.

Same here 99 percent in two months and I have barely charged the battery passed 90 percent ever been taking utmost care about the battery.

I know people having 10 months age still it’s 100 percent

it’s really disappointing

add to that my camera opens on its one at least 10 times a day