If you are in the United States, your replacement product is covered by a one-year warranty or AppleCare. However, if you're out of warranty, Apple charges a service fee of $69-$99 for an iPhone battery replacement.
When your iPhone battery drops below 80% of its original capacity, a feature called Performance Management may automatically apply. This helps prevent unexpected shutdowns.
However, performance throttling can be turned off. Look for the small "Disable" button at the end of the text below "Peak Performance Capability."
If you see a message saying that your battery's health is degraded or unknown, go to an Apple Store, contact Apple Support, or if you want a certified Apple battery replacement, contact an Apple Authorized Service Provider.
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