Is 25 watts charger is good for iphone 11? Or I should switch to 20 watts? I'm worried that it might affect the battery health. I'm a new iphone user so I don't have any idea.
It was 96 BH then it dropped to 95% in just 2 weeks
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It doesn't really matter.
When to charge your iPhone or iPad - Apple Community
What your maximum capacity was two weeks ago and what it is today doesn't tell us much. It's only one data point. It could have been 96% yesterday and 95% today but that doesn't mean it dropped 1% in 24 hours. You'd need to know how long it was at 96%.
There's really no reason to be checking battery health unless 1) you're having a problem with your phone or 2) your warranty is about to expire and you want to see if the battery health is at or below 80%.