How Much Does the 80% Charging Limit Help an iPhone’s Battery After a Year? ⇥ macrumors.com
Juli Clover, MacRumors:
With the iPhone 15 models that came out last year, Apple added an opt-in battery setting that limits maximum charge to 80 percent. The idea is that never charging the iPhone above 80 percent will increase battery longevity, so I kept my iPhone at that 80 percent limit from September 2023 to now, with no cheating.
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.
I am grateful to Clover for running such a long experiment.
My year-old iPhone 15 Pro (not Max) which I simply used every day and charged to 100 percent overnight: max capacity: 89 percent, 344 charge cycles.
@gruber My iPhone 15 Pro is set to optimized charging up to 100%: 411 cycles, 91%. It seems like her Pro Max actually performed…worse than yours and mine? (Every battery is a little different.)
I received my iPhone 15 Pro on the first day it was available. Its battery is reporting 95% of its maximum capacity with 273 cycles. I use it normally, have never changed battery settings from the default, and it often runs beta iOS releases.
Some caveats: all of us are our own n of 1 study; a handful of those is not data. I would imagine Apple has a reason for creating this preference, too.