iphone 12 pro max battery health degrading

There’s more that can go wrong with batteries than loss of capacity. One is increasing internal resistance, and the symptom of that is sudden unexpected shutdowns. Apple can test the battery remotely, so you can contact them to do that with the Get Support link at the top of this page.

Your battery is designed to hold 80% health at 500 cycles under normal conditions. My phone hit 80 percent and remained there for a very long time. 80 percent health is an estimate of your health based on use, environment, etc. But yes, it still supports peak operation and there is nothing wrong with the battery at this time. Again, if it falls to 79 percent, then have it replaced.

What do you mean by “NOTHING” in the background? Are you killing apps intentionally? Do you realize that only removes them from the list of recently used apps, it does not prevent them from restarting to process notifications, content updates and downloads? And that killing apps actually increases the load on the battery when those apps reload rather than just resume? As most of your energy is being used by 4 social media apps, which update constantly, I see nothing unusual in your usage.

annamaria9888 wrote:

My battery life is in 88% and I use the phone almost a year. Do I have to go to change it? Do you have any recommendations? Thanks a lot.

The battery is working normally if it does not display a message saying the battery is degraded and the maximum capacity is above 80%. 88% after a year is in the normal range.

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.

Awais_295 wrote:

I bought my iPhone 12 Pro Max 128gb in February 2021.

Sadly I’m on 90% battery health.

At one point the % dropped a few digits within a month.

Yup, what you're seeing is absolutely normal. On average, you'll lose 1-2% a month.

jena9694 wrote:

I purchased my iphone 12 pro max june 2021, and it took me 8 months before my battery health went down by 1%. Literally 2 days ago. I was even a bit sad when I found out because my brother’s 11 pro max took 10 months for the batt health to go down by 1% and i just thought I wasn’t taking care of my phone properly. Turns out my brother told me that’s it’s good enough.

I wouldn't be surprised if the actual battery health is less than 99%. I've gotten the official battery diagnostic from Apple (during a battery replacement service) and it was a few percentage points lower than iOS was reporting. I've also used other tools (coconutBattery for Mac) that go deeper into the actual battery statistics including cycle count. There are some really oddball behaviors with iOS battery health, including where people saw anywhere from 3-7% drop overnight. But in reality it's not a real time indicator of battery health, but an estimate that gets updated on its own schedule.

crystal_star wrote:

By extreme temperatures, what numbers specifically? Because I'm using it on a power bank now and it's kind of hot. Is it also bad to fast charge?

Faster charging inherently produces more heat, but that can be controlled. If it were really that bad, then the charge current would always be restricted. But what Apple allows is a compromise between battery longevity and the convenience of being able to charge faster. Lithium-ion batteries tend to get hotter when charging as they approach 100%, so the charge current will be reduced. Here's an article that shows it with a chart on the voltage and charge current. The current can typically approach the maximum allowable charge current (constant current) until it's about 70-75% full. Then a power management system will start to reduce the charge current (saturation charge). The closer it gets to 100% the lower the charge current will be. This is important to both keep the heat down, to reduce stress on the battery, and for safety reasons. Early attempts to charge lithium-ion batteries at a constant rate to 100% resulted in a lot of battery fires. The other thing here is that it can be relatively safe to charge up to that 70-75% fairly quickly, but to complete the charge to 100% will take longer - possibly longer than twice the time it takes to get up to 70%.

https://batteryuniversity.com/article/**-409-charging-lithium-ion

Theoretically there can be tiny benefits to charging with a lower current. It will just take longer before it gets to the point where it enters the saturation charge phase.

As far as too hot goes - an iPhone will go into a protection mode. All the user will see is a message that it needs to cool down. It's minimally powered such that just the warning message is displayed. I've seen it a few times, but generally only when I might have placed it in a car in bright sunlight. The message will look like this:

The emergency mode is just to access the phone for making an emergency call.

h1llbilly wrote:

My home phone is a 12 pro - it's 15 months old. Many features are turned off. I don't carry it everyday. It sits on a table fully charged every morning, or a carry it in airplane mode. I unplug the charger - after 8 hours, it loses between 9 to 15 percent (that's not too bad). It's connected to wifi, no bluetooth. Now, the battery capacity is 93 percent ( its hardly used). The capacity concerns me, because the trade depends on the phone keeping a charge. I can't trade until the end of a 30 month period.

I use an iPhone 8 Plus for work. I've used it for over 50 months. Its on and off the charger everyday. It's used for email, teams, photos, internet, etc...the battery capacity is 99 percent ( is this right?).

The iPhone 8 Plus seems to have a much better battery life. With the purchase of a new phone, I expect a better quality phone - iPhone 12 pro should out perform previous versions....I'm thinking about changing brands

Batteries are essentially a commodity, and not one where Apple necessarily any better or worse quality than anyone else. They buy from first-tier suppliers, but they can't account for the randomness of battery performance.

If you're looking to trade in a phone with Apple, the battery capacity hardly matters. They don't care. Any trade in value assumes that the battery will need to be replaced, because it usually will need that.

I also wouldn't assume that the battery health is 100% accurate. It often seems to hold off and then updates where it might drop suddenly My iPhone 7 battery seems to be stuck at 92% battery health for a year, and I'm pretty sure it's lower than that. I expect it's going to update any time.

Apple's rating is for 80% after 500 complete charge-discharge cycles. Obviously that's been shoehorned into nice round numbers and can't possibly reflect an exact outcome. Some will do better and some will do worse, which is common with almost any item that wears.

Mine was purchased also last November and is already at 94%. No, they don't allow replacement unless it's below 80%, or you can claim Applecare+ for a replacement which will cost you.

Completely normal.

Apple has introduced software updates to quantify battery health on iPhone 11s in a new way.

About recalibration of battery health reporting in iOS 14.5 - Apple Support

Again:

• Don’t worry about it, just track it.
• If it falls to or below 80% within one year, Apple will replace it under warranty.

There’s no need to stress about it otherwise.

There’s no reason to even think about replacing your battery.

The guide for battery health is it should be 80% or above after one year of use.

Yes, and my launch 12 Pro Max is down to 92%.

Again, this is normal, but if it falls below 80% by November, Apple will replace the battery for free.

There is nothing to fix.

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

Well mine for a fact was dropping 3% a week when I started playing a high demanding game that is once I got rid of that game I’m only losing 1% every 2 weeks