Battery life after 10 months.

It's normal.

Read this support article about iPhone battery and performance to learn about the battery health feature and what is considered normal performance --> iPhone battery and performance - Apple Support

To see the feature go to: Settings > Battery > Battery Health

"A normal battery is designed to retain up to 80% of its original capacity at 500 complete charge cycles when operating under normal conditions. The one-year warranty includes service coverage for a defective battery. If it is out of warranty, Apple offers battery service for a charge." A degraded battery may display the notice: "Your battery’s health is significantly degraded. An Apple Authorized Service Provider can replace the battery to restore full performance and capacity." If it is not at or above 80% "normal", consider contacting Apple about a battery replacement. --> iPhone Battery Replacement - Apple Support

According to the above quoted information, you could be losing almost 2% per month the entire first year before Apple would deem this to be unusual battery behavior and merit a warranty replacement.

Also read:

- Apple’s support article about batteries draining too quickly —> If the battery in your iPhone or iPad drains too quickly - Apple Support

- This post by ASC contributor Lawrence Finch which has a very user-friendly explanation of battery features --> Bettery health maximum capacity - Apple Community

I believe the Battery Health feature is only an estimate, not a precise measure. In other words, a percent or two off of what is estimated might be negligible.

On average, the Battery Health will decline about 1% for every 50 Charge Cycles. So, to make things simple, let's say that your battery has completed 350 cycles. 350 divided by 50 = 7%, so you might expect the Battery Health to be at about 93% at this point.

Your battery is declining a bit faster than normal, but really nothing to be concerned about, since Apple will not replace the battery unless it is at less than 80% in the first year of operation.

Check the battery settings to see which apps are using up the most power and try to cut back a bit on them if you want to try to slow down the battery decline.

thanks for reply, but apple didn t said that after iphone 15 the batterys should retain up to 80% for 1000 cycles?

Let's take a look at what the Apple Support document actually says in this regard: Here it is:

Batteries of iPhone 14 models and earlier are designed to retain 80 percent of their original capacity at 500 complete charge cycles under ideal conditions.1 Batteries of iPhone 15 models [and higher] are designed to retain 80 percent of their original capacity at 1000 complete charge cycles under ideal conditions.1 

Notice the "1" footnote next to "under ideal conditions". "Ideal conditions are never defined exactly, but your battery is not operating under ideal conditions.

That is why I asked you to check your battery settings to find out which apps were using the most power. Some apps are power hogs. If you can cut back a bit on the apps that are using the most power on your iPhone, you may be able to improve things a bit.

The bottom line.......replace the battery when it drops under 80% Maximum Capacity.

Ciocio03 wrote:

thanks for reply, but apple didn t said that after iphone 15 the batterys should retain up to 80% for 1000 cycles?

That is a design target. Apple didn't promise a straight line, and they only guarantee 80% within warranty period.

Wait til you have charged 1000 cycles then see where you are. You are preempting failure.

All rechargeable batteries are consumable components that become less effective as they chemically age.

Recent software updates can accelerate that process by adding features that consume more power.

As lithium-ion batteries chemically age, the amount of charge they can hold diminishes, resulting in shorter amounts of time before a device needs to be recharged.

Li Ion (Lithium Ion) batteries have recharging capabilities; however there are limits.

Temperature Effects on Li Ion Battery Life:

• Capacity loss in standby applications is largely determined by temperature
• Annual capacity loss tends to decline as the battery ages
• 80% remaining capacity is generally not the end of a lithium battery's useful life, but recommended by Apple for replacement

I recommend to slow charge your iPhone to maximize the charge capacity, battery health and efficiency. ⚡️🔋

NOTE:

Temperature: Charge above -30°C and Discharge below 55°C.

Apple won’t replace the battery until it reaches 80% capacity.

Battery Performance Tips:

• iPhone Battery and Performance.
• Check battery health and usage.
• Optimized Battery Charging.
• Maximizing Battery Life.
• Use Low Power Mode.
• About battery usage.
• Show battery percentage.

Click ▶︎ iPhone User Guide. 📖

Good luck! 👋🏼😉

Smiliñ 😎 Brian

Yes, that’s what the estimate is, for some newer models. Averages are just that, an average of millions of batteries capacity after two years of use. This means some will be lower and some will be higher. But the average will 80% capacity after 1000 cycles in 2 years.

The variables are many, usage conditions, charging habits, storage conditions and even the batteries themselves. No two batteries age the same. Another often left out fact is lithium ion batteries don’t age in a linear fashion. They speed up and slow down as the chemical structure of the battery changes with age and usage.

I don’t buy iPhones to babysit the battery. I buy iPhones to use and enjoy the experience. I charge my battery to get maximum enjoyment from my iPhone. I charge it when it needs it to 100% using optimized charging. I typically get 3 to 5 years out of a battery.

i'll bet it will level out at 87% at 2 years old and for a long time after.