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There's an explanation here about this:
Quote:

The situation has to do with how lithium-ion batteries age. Were all familiar with batteries losing capacity as they get old, but they also have less voltage. It turns out Apple didnt include enough headroom for the battery, and its voltage can fall below what is needed to power the custom A-series system-on-a-chip. Without enough voltage, the phone can just shut down without warning. Apples solution to this was to add performance throttling to iOS based on battery voltage. So, if your battery is degrading, your phone gets slow.

Source:
http://www.extremetech.com/mobile/2...lowing-iphones

And here too:
Quote:

If the performance drop is due to the sudden shutdown fix, users will experience reduced performance without notification. Users expect either full performance, or reduced performance with a notification that their phone is in low-power mode. This fix creates a third, unexpected state.

Source:
http://www.geekbench.com/blog/2017/...d-battery-age/
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Quote:
Originally Posted by dukhiatma View Post
There is also a google search trend where there is a spike in the term "iphone slow" every time a new iPhone is released.
So it seems. And it seems that for quite some time, there have been people saying that Apple is deliberately slowing their phones.

However, iOS v10.2.1 seems to have been released around Jan/Feb 2017: I think this was the first time Apple throttled the processor.

The rumours that Apple deliberately slows down iPhones have been there from before the release of iOS v10.2.1. How come? Could it be that people who lack any understanding of why a phone could slow down over time are the ones spreading these rumours?
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Originally Posted by Thermometer View Post
Umm, no. The power saving mode is not equivalent to what Apple is doing to prevent shutdowns due to peak demands on the battery.

Many elements work below the hood and are not available for tweaking in several OSes including Apple, Windows and Android.
The Power Saving Mode may not be the exact same thing what Apple is doing but is a very light version of the processes employed by Apple. Apple is doing it a different extreme altogether.

My point is simple, if Apple could silently enable this deep throttling of the SoC, it could have given the end user the choice to accept it or not. Apple is surely not helping its case by declaring that since it offers 1 year warranty it is only responsible for the peak running of iPhone for 1 year. After that it can't be held responsible but it surely is doing everything to mar the user experience of it's customer.

I think Apple was doing penny pinching in the specs of the battery and rather than admit its mistake and recall the phones, it did everything to cover it up. Now its going to come and bite it.


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Quote:
Originally Posted by Thermometer View Post
Umm, no. The power saving mode is not equivalent to what Apple is doing to prevent shutdowns due to peak demands on the battery.

Many elements work below the hood and are not available for tweaking in several OSes including Apple, Windows and Android.
As well, another caveat.

A typical benchmarking test stresses the processor.

In this particular scenario of a weakened battery, iOS will throttle the processor. Because the processor is being stressed.

In day-to-day usage, a normal user will likely see less of this throttling. Because day-to-day usage is not the same as a benchmarking test.
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Well they have issued this letter addressing the situation:


Quote:
Weve been hearing feedback from our customers about the way we handle performance for iPhones with older batteries and how we have communicated that process. We know that some of you feel Apple has let you down. We apologize. Theres been a lot of misunderstanding about this issue, so we would like to clarify and let you know about some changes were making.
First and foremost, we have never and would never do anything to intentionally shorten the life of any Apple product, or degrade the user experience to drive customer upgrades. Our goal has always been to create products that our customers love, and making iPhones last as long as possible is an important part of that.
http://www.apple.com/iphone-battery-and-performance/

http://www.macrumors.com/2017/12/28...ce-price-drop/
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Samsung and LG say they dont slow phones with older batteries like Apple

By Jacob Kastrenakes
Dec 29, 2017

Following Apples apology for its lack of communication over how it manages iPhones with older batteries, Samsung and LG have come out to say that none of their phones employ similar practices. Both companies emailed Phone Arena to say that they dont slow down their phones processors as their batteries age. LG said, Never have, never will! We care what our customers think. Samsung said, We do not reduce CPU performance through software updates over the lifecycles of the phone.

Samsung and LGs responses come a day after The Verge reported statements from HTC and Motorola, with both companies saying they did not throttle their phones performance as batteries age. Taken together, the statements make it clear that Apples battery management practices arent standard industry behavior. Whether thats because other phones dont need this kind of performance adjustment or thats because other companies didnt think to do this is something we cant say, but the broad frustration and confusion over the issue suggests Apple went too far.

After iPhone owners published benchmarks last week showing the phones processor being slowed, Apple acknowledged the behavior, saying it was done to preserve phone performance as their batteries aged. The decreased performance was meant to prevent random shutdowns, and as Apple said yesterday, is one of many battery preservation techniques it employs. While it doesnt sound like Apple plans to stop this practice since the general intention of extending the devices usefulness is a good one it does seem to be taking steps to be much more transparent with iPhone owners. And hopefully, in the future, itll make iPhones that dont need these adjustments quite so soon.

http://www.theverge.com/circuitbrea...atteries-apple
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