Except charge level means nothing, the batteries degraded and couldn’t supply the voltage the SoC needed at peak. This is actually expected and why batteries are considered EOL once they drop 80% capacity.Apple screwed up power management of their processor and it caused phone shutdowns at very healthy battery charge levels (as high as 40%). It was a design flaw for which they had to compensate with throttling. Good example to point out how the customers discover major flaws.
Apple sucked at explaining that batteries need to be replaced.
The battery could no longer supply the expected voltage to run the SoC at peak performance, it required X voltage and a degraded (“unhealthy”) battery could not supply this voltage. Capping the SoC means they lowered the required voltage to match the voltage the battery would supply. All electronics require a certain voltage to perform properly, degraded batteries naturally reach a point where they cannot supply this. Solve that issue and you have a battery we haven’t (to my knowledge) ever seen.
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