Battery life
My phone battery maximum capacity dropped form 100% to 97% not more than three months after I have bought this phone.
iPhone 11, 13
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Williamtkx ~ Apple says: "Maximum battery capacity measures the device battery capacity relative to when it was new." ...So not relative to when you bought it. Also, in measuring a chemically dynamic process such as in a battery, it's unlikely that the estimate can be accurate to within 3%. Read more in this Apple Support Article:
iPhone Battery and Performance
...found by searching Apple's Knowledge Base.
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