"The battery in my iPhone 15 Pro Max was manufactured in December 2023 and first used in March 2024 (it was delivered to me on March 9). At the time of writing, it's early September 2025, so the iPhone is around 17 months old. According to the data stored by the operating system, battery health is normal, maximum capacity is 89% compared to when it was new, and it has been through 501 recharge cycles -- almost exactly halfway through those 1,000 recharge cycles."
"and ensured it remains away from extreme temperatures. Now it doesn't last a day I start the day with an 80% charge because that's the charge limit I have it set at, and by late afternoon, it's hovering close to -- if not past -- the 20% zone. This iPhone is running a beta version of iOS 26, with Adaptive Power enabled,"
The iPhone 15 Pro Max's battery was manufactured in December 2023 and first used in March 2024, making it about 17 months old. Operating-system data shows normal battery health with maximum capacity at 89% and 501 recharge cycles, roughly half of Apple's 1,000-cycle expectation for 80% capacity. Charging behaviors include a permanent 80% charge limit, avoidance of prolonged charging, and protection from extreme temperatures. Despite those measures, daily usable battery falls from 80% in the morning to around 20% by late afternoon. The device runs an iOS 26 beta with Adaptive Power enabled and settings show no apparent abnormalities.
Read at ZDNET
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