My ‌iPhone 15‌ Pro Max battery level is currently at 94 percent with 299 cycles. For a lot of 2024, my battery level stayed above 97 percent, but it started dropping more rapidly over the last couple of months.

In this MacRumors article, Juli Clover mentions that she set her iPhone 15 Pro Max to charge to a maximum of 80% for a year. This ensured that her battery remained above 97% of its life for most of the time, recently dropping slightly below 94%. Not bad.

What surprises me is how many charge cycles both she, Gruber, and others put their phones through in a year.

I'm at 134 cycles, having started using mine in November 2023, so it's just a two-month difference compared to them. I've never set my battery charge limit below 100%, and my only rule is never to let it charge below 45%.

Maybe this is the real secret to maintaining good battery longevity? My battery still has 97% of its life, and I have no intention of replacing my iPhone.

For a few days now (with the iOS 18 update release), I've been testing a charge limit of 90% to see if I'll experience a sudden drop too, or if I can keep my phone's battery healthy for a decent period.

What about yours?