this post was submitted on 12 Aug 2023
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Well you clearly have an axe to grind if you think an average lithium ion battery is going to perform like new years after purchase. Your argument is that it should work perfectly forever, which isn't logical whatsoever.
I never said that. My point is that if a device requires 1200mA peak current draw to function at full performance, the battery needs to be selected so that it can deliver that demand for the lifetime of the device. The support lifecycle for iPhones is about 7 years, so if the minimum discharge of the battery drops to 80% after 7 years, the battery should be selected to have a nominal discharge current of about 1500mA.
That would increase cost and probably also the size of the phone, likely to unacceptable proportions.
I just don't think your position is reasonable. We don't expect car manufacturers to produce engines that never lose horsepower or never need oil changes. Why would we expect similar from electronics that cost a fraction of a car?
But you know, I still support your right to hold that position even if I disagree.
Probably, but that’s why you make trade-offs in the design process. With a BOM of $236 and a MSRP of $750, it’s not like we’re starting from a razor-thin margin here.
Doubtful - total charge capacity does depend on volume, but nominal discharge current is mostly orthogonal.
Of course not. But if a car manufacturer designed their transmission so that after 40,000 miles, gear 7 and 8 stopped working because the gear teeth were too worn down by that point, and the automatic selector would top out at gear 6 to avoid stalling the engine, you’d definitely have a lawsuit and recall on your hands.
This is all about norms of consumer expectations. People expect that battery life of their devices will degrade over time. They don’t expect that performance will do the same.