Battery health dropping drastically on iphone 15 pro max

On average, Battery Health will decline at a rate of about 1% for every 25 charge cycles.

So, to make things easy, let's say that your battery has gone through 225 charge cycles, even though the actual number is 222.

So 225 divided by 25 = 9%. So, it would be normal to expect that the battery was at about 91% at this time. If your battery is at 95%, you are doing very well.

So "drastic" would not be the right word to describe the decline on the battery on your phone. "Very good" would be a more accurate description of the battery performance.

If you want to use the 222 number, 222 divided by 25 = 8.9%, so the battery might really be at 91.1 %, but Apple always rounds the number down, so it will be displayed as 91%.

By the same token, a battery that is at 91.9% will also display at 91%. Users go bonkers when they see that the battery might drop 2% in a month, when the battery really only dropped from 91.1% to 89.9%, which is drop of only 1.2% ,but it will display as a 2% drop because of Apple's "rounding down" method.

I'm going to second the thought from Limnos that way too may users spend way too much time worrying about the battery. It's a battery.....a chemical device.....it will need to be replaced when it's down to 80%.

You have a long way to go on your battery. There is no need to check the battery statistics all the time. Worrying about the battery will not improve its performance.

It is still within expectations.

Even rechargeable batteries get worn down and 1-2% health loss per month is perfectly normal. Referring to the "Your battery's maximum capacity" section of the support article: iPhone Battery and Performance - Apple Support - "A normal battery is designed to retain up to 80% of its original capacity at 500 complete charge cycles when operating under normal conditions." Apple apparently only considers it unusual (and covered by warranty) if a battery drops below 80% maximum capacity in less than a year after you receive it. Ergo, some storage loss as you use it is anticipated and acceptable. A possible 20% drop over the first 12 months equates to 1-2% drop per month being within the range of what Apple finds acceptable. "The one-year warranty includes service coverage for a defective battery. If it is out of warranty, Apple offers battery service for a charge." In other words, if maximum capacity is below 80%, the battery is below normal performance and worth replacing. A notification will appear about this. You can still use a device with a lower health percentage than 80% but for optimal usage you may wish to consider having it changed when it reaches 80% battery health.

What this basically means:

- If battery health drops a few percentage per month that is normal.

- If battery health drops below 80% before the end of the first year, contact Apple about a warranty replacement. (Apple will test it to determine its actual eligibility.)

- If battery health drops below 80% (you will see a warning message) after the first year, consider getting the battery replaced but anticipate paying for it.

In principal. Only Apple could say for sure.

You're down to only 95% in 6 months, so extrapolating your current usage would mean you wouldn't reach 80% until the end of your second year. That's well beyond the warranty period for the battery.

It is quite common on the forum to see people freaking out in situations just like yours. I cannot recall anybody actually having a true issue with a battery that merited warranty replacement. Maybe there's one or two I didn't see but people seem to spend a lot of their time worrying about battery health when it is not by any means justified.