How can I maintain my iPhone 12's battery capacity?

My iPhone 12 battery was having maximum capacity of 91 but now reduced to 85 in a month. What can I do to maintain that capacity for now.


[Re-Titled by Moderator]

Original Title: How to maintain iPhone

Posted on Dec 1, 2025 4:58 PM

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2 replies

Dec 1, 2025 5:33 PM in response to SHADRACKMEDIA1

To learn about maximizing (and the difference between) battery life and lifespan, read this support document --> Batteries - Maximizing Performance - Apple


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


Dec 1, 2025 5:08 PM in response to SHADRACKMEDIA1

Your battery health is always going to degrade with the only way to slow it down is to not use it. The iPhone 12 is expected to last for 500 charge cycles before the battery needs replaced when it drops below 80%. While time will also reduce the battery health due to chemical aging, the simple use of the battery also reduces the battery health. The drop in battery health is not linear meaning you may not see a drop in some months and other months will drop more. Under average use, you can expect the battery to last about another 5 months, but of course that is just an average based on normal usage.

How can I maintain my iPhone 12's battery capacity?

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