iOS 18.1 update worsen your iPhone battery life? Don't let this spec fool you
Briefly

"It's important to understand that the Maximum Capacity number is not a measure of overall battery wear. It indicates battery capacity relative to when it was new."
"Many users obsess over their iPhone's battery health, often panicking over a small drop in capacity immediately after an update, which is generally not indicative of true battery health."
Read at ZDNET
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