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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Known issue
by quatermass on Wed 20th Dec 2017 22:03 UTC
Member since:

Not surprised.
When smart phone batteries get a tad old, say after 18 months, a sharp increase of performance by the device will cause the battery (which may claim it's at 25%) to shut down.

The reason for this is the old problem of crystals developing inside the battery which reduce the capacity of the battery. So the battery monitor is basically no longer accurate. The battery voltage dips slightly and the phone thinks it's about to run out of juice.

Happens in ALL phones.

Get a new battery...

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