iPhone 15 battery health dropped in one month of usage

This is perfectly normal, if your other phone only degraded 1% in a year, then there was something wrong with the sensor.

Batteries degrade over time with usage due to chemical aging, that's just how they work.

You can expect about a 1% drop per month with average use on an iPhone. This is an approximation, that is why it may be plus or minus a few percent on a month to month basis.

Apple recommends replacing it when it reaches 80%. To check your battery health, go to Settings > Battery > Battery Health.

iPhone Battery Replacement.

iPhone Battery Repair & Replacement - Apple Support

About Lithium Ion Batteries

iPhone battery and performance - Apple Support (IN)

Here are some tips on maximizing battery life.

Batteries - Maximizing Performance - Apple

Read this user tip, it will explain the battery degrading and why what you’re experiencing is normal:

About battery health on your iPhone - Apple Community

Dropping battery health is normal with battery usage due to the chemical processes in the battery.

See this user tip I have written for further reference about the issue

About battery health on your iPhone - Apple Community

Iphone 15 Pro Max. (November 2023)

Optimized battery charging, never charged below 20%.

Still 100% health after 110cycles.

All charging done wirelessly on non-Apple charger. Only some 5 charges by cable to top it up to 80%.

Nooo bruh my friend purchased iphone 13 his battery health dropped from 100 to 99 after three and half month i purshased my iphone 15 april 28 2024 now my battery health is 98 after 52 cycles what is this apple ???

You are comparing apples to oranges and expecting them to taste the same.

With the iPhone 15, on average, you will lose about 1% for every 25 cycles. Your battery is normal.

Take the phone in to an Apple shop and have them run some checks to confirm.

The phone is 5+ months old. Max Cap should be at about 95% by now.

Maximum Capacity is going to drop......on average.....at about 1% a month. That is an average. Some months in a row it might not drop at all and then drop 2-3% the next month.

Your battery is performing normally.....exactly the same as the two iPhone 15s here at the house that are both 8 months old and displaying a Max Cap of 92%.

After 12 months, Max Cap will be in the 88-90% range. After 24 months, it will be down to about 80%. Replace the battery at 80%

hi nishanth, calculate battery health from the month of purchase and usage. measuring battery health 5 to 6 months once will help us understand how the reduce is happening. Follow the suggested charging practice and it helps to maintain it overall to reach 2.5 years overall lifetime to reach 100 to 80%.

1. Charging Practice - Avoid draining the battery frequently. If it happens rarely, not an issue. But don't drain it frequently as it could affect battery health.
2. Cable and Adpater - Use original charging cable or mfi certified cable if its lightning cable. If its USB C, then use original or any branded cable. that will help.

That is all I do to maintain my iPhone battery health. Answered Why is my iPhone battery health reduced? here.

My iPhone 15 with 68 charge cycles has reached battery health 99% and I got it on May 1.

I use 80% limit and always charge it in a cool environment and never do over night charging.

congratulation wrote:

I bought iphone 15 pro max less than 2 months later, the battery health has dropped from 100% to 99%

That's within normal parameters.

and this phone heats up a lot and the battery also drains fast. What is this? I am very stressed.

Do you mean it heats up and shuts off? Or do you mean that you see the notification that your phone has stopped charging until it cools down? If the former, you may have a hardware issue. The latter is normal behaviour if you have Optimized Battery charging enabled. And how fast is "fast"?

Life is much better if you don't try to micromanage your iPhone battery.

Georgianaaa wrote:

Hi! I have an iPhone 15 for almost 5 months (Bought on December 10) and my battery health dropped at 97%. I m so worried because I don’t think it’s normal to drain like that when I have my 80% limit too and rarely charged at 90-100% (happened 4-5 times at the begging). I charge my phone when is 18-19% and I have 172 cycle count. If there is someone to help me with advice, thanks!

What you're seeing is normal.

You can charge your phone whenever you want. There is no need to wait to some arbitrary percentage.

This is inaccurate. Please explain how my family purchased 4 iPhones the same day, and I’m the only one with the pro max and it has degraded to 98% after only 50 charging cycles. Meanwhile, everyone else in my family has basic iPhone 15’s and they all show 100% life after 100 charges.

what that tells me is that the base iPhone 15 has a much better battery.

according to apple, the iPhone 15s are supposed to last a full 1000 charge cycles, and that is based on degradation to 80% battery life.

do the math and you’ll find that a 2% drop after fifty cycles means you’re phone battery will hit 80% in well under 500 charging cycles. The pro max has a bigger battery and should last longer than the basic iPhone 15. I’m not talking day to day, I’m talking about time intervals between needing to replace the battery

I bought an iPhone 15 the day on launch (Friday September 22th) and after 368 cycles it’s at 88% battery capacity I thought these new batteries were supposed to be good for up to 1000 cycles like Apple said this battery is only going to live up to around 545 cycles which is like 45% less then advertised.

Batteries are chemical products. They easily effected by environmental conditions. Apple guarantees that the device will not decrease more than %80 of battery health in 2 years. So if it ever decreased below %80 in 2 years at that point it is not normal. At that situation, the battery change made by apple. At ideal conditions iphone 15 should remain 80 percent of battery at cycles of 1000. But it is not guaranteed.

Your battery health will drop 1-2 percent per month; This is normal. Health would never drop 1-2 percent over 1 year, that would not be normal at all.

Your battery performance is normal. After 10 months, the Maximum Capacity should be at about 88-90%.

Replace the battery when it is down to 80%