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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RE[3]: Known issue
by Alfman on Thu 21st Dec 2017 16:39 UTC in reply to "RE[2]: Known issue"
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I managed to run more benchmarks. It looks like my phone's performance remains quite stable regardless of the battery's voltage or being plugged in.

Can anyone perform the benchmarks on an iphone afflicted by the software slowdown? In particular I'd like to see if plugging in the phone restores the performance versus low battery.

Edited 2017-12-21 16:44 UTC

Reply Parent Score: 3