A year-long test of Apple's 80% charge limit feature on the iPhone 15 Pro Max has revealed only marginal benefits to battery health. MacRumors editor Juli Clover reported her device maintained 94% battery capacity after 299 charge cycles, compared to 87-90% capacity for iPhones without the limit. The opt-in setting, introduced with iPhone 15 models, aims to extend battery longevity by restricting maximum charge. Clover adhered strictly to the 80% limit for 12 months, noting occasional inconveniences like depleted batteries during long days. While the test showed slightly better battery health retention, Clover questioned whether the trade-off in daily usability was worthwhile. She adds: I don't have a lot of data points for comparison, but it does seem that limiting the charge to 80 percent kept my maximum battery capacity higher than what my co-workers are seeing, but there isn't a major difference. I have four percent more battery at 28 more cycles, and I'm not sure suffering through an 80 percent battery limit for 12 months was ultimately worth it. It's possible that the real gains from an 80 percent limit will come in two or three years rather than a single year, and I'll keep it limited to 80 percent to see the longer term impact.

Read more of this story at Slashdot.