Maybe, but we don't need an Apple device to determine underperforming. All we need is the battery and the battery manufacture specs. Apple are in a bit of a quandry and being up front in the first instance, (which they almost never are), is what has garnered so much attention. Here's how I see it, an analogy if you will;I can see your standpoint, but the problem here is defining ‘underperforming batteries’. And also, consider the fact that Apple has never advertised their processors’ clock speed or benchmark results.
The problem here is, Apple has never stated the clock speeds of their processors. The only thing they advertise is how much faster it is compared to the previous gen iPhone in a percentage. Think of it this way. Let’s say an iPhone X has a worn out battery and the software is downclocking the CPU by 20%. And let’s say Apple’s marketing materials say that the X is 70% faster than the A10 Fusion chio in the iPhone 7. When that’s compared with an iPhone 7 also with a worn out battery and also had its processor downclocked by 20%, the X is still 70% (just as an example, not sure how much faster is the X vs the 7) faster than the 7.
1. Company 'A' has installed an emergency lighting system in your building. 10 months later you have a power cut and the lights come on for the specified 3 hours but they are dim because that company have adjusted the controller to hide the fact that the battery has unexpectedly deteriorated. As a consequence you never addressed it.
2. Company B designed it properly up front and made sure that it was specced for 3 hours at end of life and let the system run as designed even though it only provided 2 hours but at full brightness. But they told you this was a problem at or before your 6 monthly service as the inbuilt diagnostics flagged it as a concern.
I'd prefer B myself, then I can get the thing fixed or modified. Apple could have provided a low power mode that did this throttling and we'd probably have been Ok with it. We could enable it until a faulty battery is replaced.
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