"In my experience, no topic generates more articles, blog posts, and YouTube videos than how to get the best possible battery life from your iPhone, both daily runtime and overall lifespan. It's also the topic on which I get the most questions and comments. People have been obsessed with their iPhone's battery life since day one, and the more metrics and tweaks Apple adds to iOS to delve into what the battery is doing, the worse it has become."
"But if every minute of runtime, every percentage point of battery life matters, does it make sense to sacrifice 20% -- or, to put that another way, one-fifth -- of your battery's capacity? It seems that the iPhone's longer battery life makes the tradeoff worthwhile. After all, that iPhone 15 models and later can "retain 80% of their original capacity at 1,000 complete charge cycles under ideal conditions.""
The battery in an iPhone 15 Pro Max degraded significantly after 18 months despite following Apple's recommended maintenance. An experiment restarted in March 2024 tested limiting charge to 80% to extend lifespan, trading roughly 20% of daily usable capacity. iPhone 15 models and later claim they can retain 80% of original capacity after 1,000 complete charge cycles under ideal conditions. Users increasingly obsess over runtime and longevity, and Apple added software features to cap charge levels. The 80% charge limit offers a manageable compromise between daily runtime and reduced long-term battery degradation.
Read at ZDNET
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