My iPhone 12 battery suddenly deteriorated
My iPhone 12 battery suddenly deteriorated from 87% to 81% within a span of 1 month, with no change in usage pattern, charger or any update….
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Here is the solution→iPhone Battery Replacement - Official Apple Support
A battery is a chemical device, and chemistry is generally pretty variable and uncertain, as well as being analog, not digital. Apple specs the battery capacity to remain above 80% for 500 full charge cycles, but that is a minimum requirement; there is no published maximum expected capacity. So sometimes batteries will perform much better than that minimum specification, and sometimes the change in maximum capacity won't be linear.
All iPhones have a specification for the battery. As an example, for the XS Max that is 3174 milliampere-hours (MaH). So the battery monitor is calibrated for 100% at that value. But there are variations in manufacturing, so some batteries will have less capacity, and some will have more. Suppose your battery had, say, 3474 MaH capacity (10% over standard). That would still show as 100% (even though it was actually 110%), but as it aged the health would stay at 100% until it fell below 3174 MaH. This would appear to you as if your battery had fabulous life.
