Linked by Thom Holwerda on Wed 20th Dec 2017 17:36 UTC

A Reddit post from last week has sparked a discussion regarding iPhone performance as a function of battery age. While we expect battery capacity to decrease as batteries age, we expect processor performance to stay the same. However, users with older iPhones with lower-than-expected Geekbench 4 scores have reported that replacing the battery increases their score (as well as the performance of the phone). What's going on here? How many phones are experiencing decreased Geekbench 4 score?

To answer these questions I've plotted the kernel density of Geekbench 4 single-core scores for the iPhone 6s and the iPhone 7 running different versions of iOS. Scores obtained in low-power mode are not included in the distribution.

Evidence seems to be mounting that Apple is decreasing the clock speed of iPhones with decreased battery capacity to maintain the advertised battery life.

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In light of the admission by Apple..
by mistersoft on Thu 21st Dec 2017 14:55 UTC
Member since:

...that they "protect the battery life performance of older iPhones" by AHEM slowing down your phone in software -

They ought to have a couple of options:
Toggle the speed back to original if you replace the battery (and ideally if you don't care about the battery performance/occasional purported shutdowns)

Confirm the set-up date on the phone and NOT throttle the speed on "new" old phones. That is, newly set-up phones of older model types. I haven't seen confirmed whether or not these OS updates are applied in a blanket fashion to all iPhone 6 6s 7 models or simply those with have been operational for 1,2,3 years..

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