batter percentage dropping fast

I agree with Mac Jim ID that you are looking at a big serving of "normal." Batteries are wear components— they age. How about a side dish of data?:

This is a partial battery history of my iPhone SE 2020 battery, which has a much smaller battery capacity than your 15 Pro battery:

(from the Coconut Battery app on a Mac computer)

Things to note:

—At about 5 months, it battery was at 98%

—Mine started life at 102% capacity

Its capacity today, a week shy of three years since purchasing the phone is:

I let my iPhone manage its battery. I charge it every night but almost never during the day.

Things to grasp regarding your battery:

—"Health" is inexact. It is based on an AVERAGE design capacity for all batteries of that model. Note that mine started at 102%. Averaging means some poor soul out there got a battery that was 98% health when new. Neither you nor the people responding here know what your actual capacity was when new.

—"Health" is non-linear. My battery history posted above is, as it should be, downward-trending but not a straight line. Also, capacity decay seems to slow down when you get below 90. Trying to apply a straight-line correlation for a 5-month old battery will only get you hypertension or ulcers.

I have another Apple device whose factory battery's health plummeted 10% in a month, then recovered to its old level within the next month. That battery is still serving at 11 years old and retains just over 80% health. I have an old iPad 2 whose original battery is nearly 13 years old and at 70%, but still runs the device long enough to complete the simple tasks for which I use the device.

—The only solid use for health I see is to give Apple techs a firm "line in the sand" when considering warranty battery replacement for a device still under warranty. Apple policy has been that, should an Apple battery in a covered device fall UNDER 80% health at LESS THAN 1000 cycles, they may elect to replace the battery at no cost to the owner.

Yes, I too used to obsess over my battery readings but gaining knowledge and being in these forums for over 20 years has allowed me to put "health" on the shelf labeled "Not Today's Issues."

Offered for your consideration.

What you are experiencing is normal. You can expect on average a drop of about 1% per month. The drop will not be linear meaning some months will not drop at all and other months may drop more. Based on this average, you should be about 95%, so you would be ahead of average. Many users have found that once it drops below 90%, the rate of Battery Health drop slows. This has more to do with the characteristics of the Lithium Batteries, than anything else. Since you are only showing about 55 charging cycles, then that would explain why your Battery Health is slightly better than average.

In any case, once it drops below 80%, it will be time to replace the battery.

Nonsense. Lithium-based batteries all chemically degrade, and the rate at which they will do so is not linear and cannot be predicted with any accuracy, though on average, battery health will decline about 1% for every 25 charge cycles, or in normal use about 1% per month. This is true for any such battery in any device. Even experienced battery engineers cannot tell you exactly how fast a given battery will degrade, so believing that Apple has or even can have "timed" this to the warranty is a totally erroneous assumption.

If you can't deal with batteries degrading over time, don't buy any battery-powered device, since that happens in all of them. BTW, AppleCare+ covers not only hardware defects and accidental damage but the battery as well.

Try charging your phone from 20% to 80% for better battery health

faraz1221 wrote:

well this means apple has not optimised its battery to its hardware or Ios and also means that the battery will drop below 80% just after the phones warranty expires, yet another apple’s neat trick to make the user pay for battery twice as always

but thank you for that in-depth analysis’s cheers

Wrong! You can expect the battery to be replaced in 2-3 years under normal conditions and may see it go longer with light use. Specifically for the iPhone 15 Pro Max it is expected to reach 1000 charge cycles before replacement is needed under ideal conditions. If you think you are going to get any phone that will not need to have its battery replaced, good luck with that. It really has nothing to do with your AppleCare warranty. View this page for the cost of replacement. Without AppleCare, the cost is $99 and with AppleCare+, the cost is $0. The choice is yours if you want to continue an AppleCare+ plan.

iPhone Battery Replacement - Apple Support

Extend your AppleCare+ coverage - Apple Support

You are experiencing better than average battery health as a result of your lower charge cycles. Under normal use you would be at 95%. Keep doing what you are doing. It is best to place your phone on the charger every night with the Optimized charge setting turned on.

Suit yourself. You asked for experiences and opinions and I gave you mine (which probably dates back to before you were born, and no, none of us are paid to participate here). If you don't want to believe and accept what I said, that's your choice. And we have no idea what you may or may not know; I'm certainly not a mind-reader and I doubt anyone else here is either.

If you want actual help, ask and we'll do our best. If you just want to complain, you can do so here:

Product Feedback - Apple

Finally, I politely suggest that you keep your snark to yourself. Thank you.