Speed up your iPhone 6s by replacing the battery

Last weekend, I read a post on Reddit where /u/TeckFire claimed that his iPhone 6s became much faster again after replacing the battery. A new iPhone 6s should get a score of ~2300 on the Single-Core benchmark and ~3900 on the Multi-Core benchmark of Geekbench 4. The poster saw scores of 1466 and 2512 respectively. After getting the battery replaced, the phone was restored to full speed again. The explanation was that as the battery degrades, the iPhone reduces the clock speed to extend the battery lifetime. I decided to figure out if my phone was affected by that as well.

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