iPhones use lithium-ion batteries, which degrade over time, and Apple says that if it did not throttle performance there would be a greater risk of internal components being damaged.
Forbes magazine said the iPhone SE, 6, 6S and 7 are all impacted.
Until now it was a conspiracy theory. After all, the natural reaction of most people when they see their iPhone slowing down is not "I need a new battery" (users never get a notification that their battery is in need of replacement), but it's more to the tune of "I need a new phone".
Apple basically confirmed as much to the Verge - but said it's been doing so to keep phones with older batteries from spontaneously shutting down. I also don't know for certain, but I believe that the iPhone 7 and up are not affected by this almost as much, since the A10 and A11 chips have separate "low power" cores that apparently run at around 1/5th of the power of the main cores, and will use those as often as possible, and only kick in the fast cores when necessary, meaning you should only see slowdowns for more intensive tasks on the 7 and up, since only one set of cores can be running at once. This is something the user found after testing his phone with Geekbench, as well as with by observing the performance of the phone.
Geekbench later did its own tests and reached the same conclusion. This year's iOS 11.2 extended the feature to the iPhone 7 and 7 Plus.
Apple defended its decision to prioritize power over performance in a statement to tech writer Rene Ritchie.
"Our goal is to deliver the best experience for customers, which includes overall performance and prolonging the life of their devices", Apple said.
As such, Apple says that a year ago, they released a feature for the iPhone 6, iPhone 6s and iPhone SE created to smooth out instantaneous peaks when needed to prevent shutdowns during such conditions. This "slowness" is particularly going to be noticeable when you are launching apps and playing games.
Apple also says iPhones work best at room temperature, or between 32 and 95 degrees Fahrenheit. Actually, it is not entirely theoretical. However, when using iOS 11.2.0, the graph showed more peaks again, suggesting the performance is impacted the older the device becomes. You should get a warranty from these shops if they're any good. 3.
Edit 2: Some information on replacing the battery: you have 3 options. 1.
Basically, Apple is giving our iPhones a slow and painful death, on objective.
I had to replace the battery inside my iPhone 6S because it was revealed that some units had faulty batteries and my phone was one of them.
Rechargeable batteries have a limited lifespan - and most Apple products have a built-in one - so the shutdown issue is something all devices will eventually have to deal with if they're used long enough.
3- Live with the slightly slower iPhone. These shutdowns are caused by processors working faster than aging lithium-ion batteries can handle, the company added.
4- Update to the latest iPhone 8, iPhone 8 Plus or the iPhone X. Ouch!
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