A curious woman decided to test the limits of her iPhone's battery life by charging it to 80% capacity for an entire year. She wanted to see if this practice would significantly impact the battery's health and longevity. The experiment began in September 2024, and she documented her findings on the Mac Rumors forum. She shared that she had previously conducted a similar test with her iPhone 15, and now she was repeating the experiment with her newer iPhone 16 Pro Max. Her goal was to see if the 80% charge limit would make a noticeable difference in battery performance. She also mentioned avoiding letting the battery drop below 20% before recharging. The woman used a combination of MagSafe wireless charging and fast-charging via USB-C to keep her phone charged. After 12 months, she found that her battery capacity was at 94% after 299 charge cycles, which she considered average. Interestingly, her colleague, who didn't have a charge limit set, had a battery capacity of 96% after 308 charge cycles. The woman concluded that the 80% charge limit didn't seem to make a significant difference, and she found the results disappointing. To further test her theory, she started another year-long experiment with an iPhone 17 Pro Max, leaving us curious about the results in the coming months.
