I don't know if it's still the case but on my old iPhone 6s, the geekbench score would differ depending on how full the battery is. Apparently Apple was pushing

I don't know if it's still the case but on my old iPhone 6s, the geekbench score would differ depending on how full the battery is. Apparently Apple was pushing these processors on the limits of what the battery can deliver and once the battery degraded they need to lower the CPU/GPU speeds to prevent the device shutting off suddenly. It even turned into a huge scandal of "Apple deliberately slowing down old iPhones" which was portrayed as if Apple is doing it to make you buy a new iPhone.