"When I got my iPhone 15 Pro Max in September 2023, I decided that I'd do everything I could to make the battery last. Well, an accident destroyed that handset, so I restarted the experiment in March 2024. CNET: iPhone Battery Showdown: 3 Years of Data Show How the iPhone 17 Models Measure Up I wanted to see just how much lifespan I could get out of the battery."
"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."
An iPhone 15 Pro Max showed poor battery performance after 18 months despite following Apple's recommended care. The experiment began in September 2023 and was resumed in March 2024 after accidental damage to the original handset. A charge-cap feature was used to limit charging to 80% to try to prolong battery life, at the cost of roughly one-fifth of daily capacity. iPhone 15 models are specified to retain 80% capacity after 1,000 full cycles under ideal conditions, prompting scrutiny about what "ideal" means in practice. Charging strategy was later reconsidered with the iPhone 17 Pro Max.
Read at ZDNET
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