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Wouldn’t it be just better to replace your battery every 3-4 years for $79 (cheaper now?)...and not worry? I have Smart Battery case...so, even when it is worn, i still have plenty of juice.
 
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As someone said, Low Power Mode does this.

I've run my 8 Plus in Low Power Mode from launch and Battery Health is 89%. So not sure how much of a real difference it makes.
 
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