Two interesting facts from the wide world of the Internet:
1. How long is a cycle in battery life?
Each round of full discharge and then full recharge is called battery cycle life. A battery's cycle life can range from 500 to 1200. That means a life cycle of 18 months to 3 years for a typical battery.
[Note the term "full discharge". I imagine most people do not let their battery go to 0%.]
2. At what percentage should I replace my battery?
When the capacity of your iPhone battery dips below 80%, you'll see the following message: “Your battery's health is significantly degraded. An Apple Authorized Service Provider can replace the battery to restore full performance and capacity."
[Maybe plantsower never saw this message, but her battery is well below 80% (it shows 23%). And artie's math is correct—the battery will always operate at 23% or less of the charge life of a new battery.]
On a Mac since 1984.
Currently: 24" M1 iMac, M2 Pro Mac mini with 27" BenQ monitor, M2 Macbook Air, MacOS 14.x; iPhones, iPods (yes, still) and iPads.
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