If the battery capacity of the Apple phone you use is only 80% or less within the one-year warranty period or the warranty scope of the AppleCare plan, you can replace 79% of the Apple battery at the Apple Store or an Apple authorized service provider for free.
Precautions:
Even if the third-party non-iphone original battery is replaced, it is not that the mobile phone cannot be used normally, but some battery functions cannot be displayed.
Some will display the word "maintenance" in the column of battery health, instead of the battery efficiency percentage of iphone, so that we can't judge the usage of mobile phone and the battery utilization rate by the battery of mobile phone, and then we don't know when to replace the battery.
Apple has introduced the function of changing batteries, which actually makes many people still think that the original batteries are reliable, so they will use the original batteries instead of choosing cheap unqualified batteries, thus reducing the occurrence of safety accidents.