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I have a new battery in my iPhone 6s. But at 50% charge it becomes very slow

The iPhone 6S also starts to slow down at 1%. Very rare and up to 10%. It’s exactly the same on the MacBook Air. And this strongly motivates you to connect to the outlet faster. And this is obvious: when the battery is low, the device automatically reduces the frequency of the processor, and the work in general.
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It goes as fast as it can under 50% but when it get to 50% or above its goes slower,its nothing to worry about.