Improving Battery Health on iPhone 15 Pro

Batteries, like people are individuals. No two people age exactly the same and batteries don’t age the same either. The exact usage, chemical makeup, storage conditions, exposure to heat and cold and about a dozen other factors mean that every battery ages differently. Battery aging is not a linear (straight line) and degrades at different rates as the chemicals in the battery age and other factors mentioned above. Below you’ll see how 4 identical batteries aged differently and 3 of the 4 in a non-linear fashion.

Apple expects your battery health to be at 80% after 24 months. If your battery health misses that expectation, contact Apple Support.

Please review the Apple Support articles on battery optimization. It contains the best  current practices for battery charging.

iPhone Battery and Performance - Apple Support

Batteries - Maximizing Performance - Apple

About the battery and performance of iPhone 11 and later - Apple Support

Your phone's battery health is doing very well. On average, one can expect to see about a 1% decline in battery health per month. The decline is not linear as it can remain steady, then decline a few points all at once. Since you have owned your phone 8 months, but your battery health has only declined 5%, there is nothing to fix.

Read this link about maximizing the battery on your iPhone, but understand there is NO WAY to stop battery health decline and then the health of your battery declines to 80%, which it will one day if you own your phone long enough, it will then be time to pay Apple to replace your battery --> Batteries - Maximizing Performance - Apple

There is no way to fix or improve battery health as it only goes in one direction, down.

Your iPhone is expected to drop about 1% for every 40-50 charge cycles, and the decline isn’t always linear. Meaning some months you will lose more than expected, other months none at all. Could you please tell us your charge cycle count?

When your battery health reaches 80%, that is when you should replace the battery.

Please take a look at these tips ⇢

Batteries - Maximizing Performance - Apple

iPhone battery and performance - Apple Support

It's normal for the battery to lose 1% of its health a month; yours is better than average. If it matters, it can't be increased except by getting it replaced, which Apple and AASPs aren't obligated to do until it's gone below 80%.

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It's normal for the battery to lose 1% of its health a month

That's a good general guideline for phones up through the iPhone 14 with batteries designed to go 500 charge cycles before they reach 80%. That works out to a 1% decline for every 25 charge cycles.

But, the iPhone 15 and 16 have batteries that have been "designed" to go up to 1,000 charge cycles before the battery is down to 80%.....(1% decline for every 50 charge cycles).....so the new math would be closer to losing .5% a month or 1% every two months.

Apple mentions "ideal conditions" for the newer batteries (and older batteries) but they don't provide any firm details on what "ideal" might be.

From Apple's documentation:

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 are designed to retain 80 percent of their original capacity at 1000 complete charge cycles under ideal conditions