iPhone Performance Degrades as Battery Ages https://www.geekbench.com/blog/2017/12/iphone-performance-and-battery-age/ …
or apple uses the battery age as a measure to decide how much to hobble your old iphone to entice you to buy a new one
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or apple uses the battery age as a measure to decide how much to hobble your old iphone to entice you to buy a new one