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The only reason I'm upset by this is speculative.

If I buy a 'boost' battery case because I know the battery is going to be getting worse with time does their software solution acknowledge this and let me keep the full speed my phone should have?

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No, it only checks the battery state. I'm suspicious it runs off the battery even when plugged in, and works like power>charge controller>battery>power management>system rather than power>power management>system when plugged in(or "plugged in" to a case). An iphone usually wont boot with no battery

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