iPhone 16 Pro Battery Health Dropping 10% in One Year Only

You can't actually overcharge an iPhone. Once it reaches 100%, charging is paused. While one might expect a Battery Health of closer to 93% with 349 charge cycles, how you use your phone has a lot to do with Battery Health. Do you game a lot? Stream a lot through social media apps, like those from Instagram and Facebook? Do you ever let your phone's battery go below 20% or fully discharge? All can impact battery health. It's advisable to never fully deplete the battery or let it go below 20% with any regularity. Do you put your phone on your charger when you go to bed and leave it on all night, EVERY night? If no, you should be doing that.

Fundamentally a 10% loss in battery health after nearly a year isn't something which should be cause for concern. Battery health decline is not linear. It can remain steady for a while, then drop a few points all at once. When the health dips to 80% it will then be time to pay Apple to replace the battery. And remember that batteries ALL decline. And that decline cannot be stopped.

Read this for useful suggestions --> Batteries - Maximizing Performance - Apple

Batteries degrade over time with usage due to chemical aging.

You can expect about a 1% drop per 50 charging cycles (25 charging cycles for IPhone 14 and older) 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%. No, Apple won't replace the battery under warranty unless it drops below 80% within the first year.

iPhone Battery Replacement.

iPhone Battery 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

Let's start with your last question.......And did Apple agree to replace the battery under warranty?

Apple will not replace the battery under warranty unless it falls under 80% in the first year of use.

Another way to say the same thing......Apple considers the battery to be normal unless it falls under 80% in the first year of operation, so there is not really any strict guideline or definition of "normal".

Under "ideal conditions", Apple states that the battery can go up to 1,000 Charge Cycles before the Battery Health declines to 80%. The rub here is that there is no definition or detail about what "ideal conditions" might be.

That works out to a decline of about 1% on average for every 50 Charge Cycles. Your battery has completed 350 Power Cycles, so under "ideal conditions", the battery would be at about 93% at this time. Your battery at 90% is not far off of "ideal" and the battery decline is not linear. Some months the battery might decline 2% and then not decline at all for 2-3 months

Obviously, some apps are going to demand more power than others. Social apps in particular are real power hogs.

Take a look at the battery performance on your iPhone and post back with the 5 apps that are using the most power. We will likely see some popular apps in your list.

Finally, don't try to babysit the battery. It is going to do what it is going to do. No point in constantly checking the battery settings. All that will do is make you worry.

The measure of battery health deterioration/drainage is subjective and can vary depending on individual usage patterns. There is no universal standard to determine whether the battery health deterioration/drainage is normal or abnormal because it heavily relies on how the battery is used and maintained.

Protect & Prolong the Life of your iPhone's Battery:

1. About the battery usage on your iPhone, iPad, and iPod touch ...
2. Batteries - Maximising Performance - Apple (IN)
3. iPhone Battery and Performance

Try to monitor Battery usage by iPhone Activity as shown below

What is shown under battery usage? Checking that would give you an indication of the usage behavior.

1. Background Activity
2. Notifications
3. Connected to Charger
4. Or any Other

See the pic below (iPhone 12 Pro iOS 17.3.1)

"Show Activity" feature will show you more info see the pic below

Try some of these options too.

To prolong the life of your iPhone battery, you can follow these tips and best practices:

To prolong the life of your iPhone battery, you can follow these tips and best practices:

1. Optimize Battery Charging: Enable the "Optimized Battery Charging" feature on your iPhone. It helps reduce the wear on the battery by slowing down the battery aging process. You can find this option in Settings > Battery > Battery Health. About Optimized Battery Charging on your iPhone - Apple Support (IN)
2. Avoid Extreme Temperatures: Extreme temperatures, both hot and cold, can negatively impact your battery life. Avoid exposing your iPhone to excessive heat or cold, such as leaving it in direct sunlight or in a freezing car.If your iPhone or iPad gets too hot or too cold – Apple Support (UK)
3. Use Original Chargers and Cables: Always use Apple's original chargers and cables or certified third-party accessories. Low-quality chargers or cables can damage the battery and reduce its lifespan. Identify counterfeit or uncertified Lightning connector accessories - Apple Support (IN)
4. Avoid Draining the Battery to Zero: Charge it whenever the charge becomes lower than 20%. The rest is up to you when to charge. how long to charge, how often to charge, which adapter to use starting from 5W to 140W USB-C Power Adapter etc.
5. Optimize Display Settings: Adjust your display settings to optimize battery life. Lower the screen brightness, enable auto-brightness, and use shorter screen timeout durations. Adjust the display and text size on iPhone - Apple Support (IN)
6. Minimize Background App Refresh: Limit the number of apps allowed to refresh in the background. Go to Settings > General > Background App Refresh and disable it for apps that don't require real-time updates. Switch apps on your iPhone, iPad, or iPod touch - Apple Support (IN)
7. Disable Push Email: Push email notifications can drain your battery quickly. Instead, set your email accounts to fetch data manually or at longer intervals. You can change this setting in Settings > Mail > Accounts > Fetch New Data.