Here’s an update on my iPhone 15 Pro Max’s maximum battery capacity, tracked from Nov 18, 2023 through May 21, 2025:
• Cycle count: 15 → 1,018
• Max capacity: 101 % (initial calibration) → 81 %
• Date range: Nov ’23 → May ’25

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1) Capacity Over Time (0–100 % scale)
A clear, full-range view for context.

2) Capacity Over Time (Zoomed 89–101 % scale)
Highlights the subtle drops—including the steepest decline during Summer 2024.

3) Capacity vs. Cycle Count with Trend Line
Linear fit shows average degradation of ~ –0.0174 % per cycle.

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Key Features & Compliance
• [OC] & code: All charts generated with Python 3.10, Pandas & Matplotlib. Code + raw CSV in top comment.
• Minimalist design: No markers, light gridlines, only essential ink (Tufte’s data-ink ratio).
• High-contrast styling: Lines and labels meet WCAG 3:1 (graphics) and 4.5:1 (text) contrast ratios.
• Direct labeling & annotations: Horizontal axis labels, end-of-line legends, “Summer 2024” call-out.
• Small multiples: Separate time-series panels avoid confusing dual axes.

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Let me know what you think! A lot of people post individual screenshots of how their iPhone battery is at one time, but I have kept track of this over a significant period of time as I’ve been curious how it would perform overtime. The battery health has stayed higher on this phone than it did with my 13 Pro Max, which would seem to validate Apple‘s claim that the battery on this phone should retain 80% of its original capacity at 1000 cycles.

Posted by Dasein1989

19 comments

  1. Date,Cycle Count,Max Capacity (%)
    2023-11-18,15,101
    2023-11-27,28,100
    2023-11-29,30,99
    2024-01-10,89,99
    2024-02-17,139,99
    2024-04-14,198,99
    2024-04-25,209,98
    2024-04-30,214,98
    2024-05-18,234,98
    2024-06-05,256,96
    2024-06-20,273,95
    2024-06-25,281,94
    2024-07-09,300,93
    2024-08-12,337,92
    2024-09-16,379,91
    2024-09-30,398,91
    2024-10-03,404,91
    2024-10-13,436,90
    2024-10-16,449,90
    2024-10-25,482,90
    2024-10-29,499,90
    2024-10-30,503,90
    2024-11-27,594,90
    2024-11-29,599,90
    2024-12-10,624,89
    2024-12-16,639,89
    2024-12-20,647,89
    2024-12-26,662,89
    2024-12-31,677,89
    2025-01-05,694,88
    2025-01-07,700,88
    2025-01-10,707,88
    2025-01-12,710,88
    2025-01-21,732,88
    2025-01-25,743,88
    2025-01-30,752,88
    2025-02-01,756,88
    2025-02-02,760,88
    2025-02-03,762,88
    2025-02-07,773,87
    2025-02-18,795,86
    2025-02-20,800,86
    2025-02-28,821,86
    2025-03-18,859,86
    2025-03-25,879,86
    2025-03-30,891,85
    2025-04-12,922,85
    2025-04-15,929,85
    2025-04-24,950,84
    2025-04-27,958,84
    2025-05-13 AM,999,84
    2025-05-13 PM,1001,84
    2025-05-14,1002,83
    2025-05-16,1007,82
    2025-05-17,1010,82
    2025-05-19,1014,82
    2025-05-20,1017,81
    2025-05-21,1018,81

  2. What made the battery health stop deteriorating between 400-600 cycles

  4. I’m at 94% and have the phone since launch, but I think they gave me a replacement when I wanted to get my charging port repaired

  5. Same start date im at 403 cycle and 87%. How did you do that many cycles ?

  6. I’m curious why yours has deteriorated down to 81% already? I have an iPhone 14 Pro Max that I purchased near launch in October of 2022. So it’s more than a year older than yours and my max battery capacity is currently at 80%, only 1% less.
    Not sure where you found the amount of charge cycles you’ve done. I don’t see that listed in the settings, but I’d be interested to know how many cycles mine has gone through.

  7. Do we know how this percentage is calculated ? I believe it is not always easy to get a reading of how much energy a battery can effectively hold so I’m curious

  8. My iPhone pro max is at 87% with 490 cycles. August 2023.

  9. I have a 15 Pro Max which I purchased in Sept 2023. I very quickly set the maximum charge limit to 80% and as of today my maximum capacity is still reported as 100%. Cycle count is 190. I typically use about 25% of my battery’s capacity per day (based on the 10-day stats in Settings).

    Just throwing more data out there.

  10. I have an iPhone 16 with 241 cycles and my battery health is at 100%

  11. Fwiw, my iPhone 11 was activated in Oct’20 (4.5 years ago) and max battery is still 75%.

  12. Interesting. I’m on an iPhone 13 Pro and sitting at 82%. I wonder if battery aging slows down right around where you’re at. I feel like I’ve been at 82ish percent for a long time now.

  13. Is the battery of the iphone able to be replaced? i.e when it reaches 50% or whatever can you go to an apple store and just ask for it to have a new one in?

  14. I don’t believe apples software when it comes to battery health. Their phones in battery test stay above 90% far too long and even sit at 100% while Samsung would drain to 94% or so. And their batttery health seems to always stall and stagnate at 82/3% which I assume is to intentionally avoid warranty replacement under Apple care. It’s too convenient a phone can drop to 82% battery health over 2 years but the third year stay at 82%

  16. Damn. My 15 pro max has 323 cycles and is all the way down to 87% health.

  17. What’s your usage pattern? It looks like you go through two cycles every day?

  18. So batteries should be swappable (by customers) and old batteries should be recycled, right?

    Simple act Apple forbid us

  19. Curious to see how this correlates to software update release timing. I’ve heard that updates often force the battery degradation as a form of planned obsolescence.

Comments are closed.