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iPhone XS Battery health dropped 2% overnight?

RickCMC

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Original poster
Sep 13, 2018
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So I’ve had the XS since launch date and as of yesterday the battery health was 94%. First off, is that normal to be at 94% after 10 months? I’m a pretty heavy user I’d say. But when I checked today it went from 94% to 92%. What the heck? Is this normal to be at this level after less than a year?
 

Newtons Apple

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Mar 12, 2014
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Well it’s at 92% now and yesterday it was 94 so I have no clue how it could drop 2 percent overnight

The battery app is not absolutely accurate.
Wait until tomorrow and when you take it off the charger see what it say then.
If it drops a few more tomorrow, that would be something to get excited about.

The battery on my last two iPhones were still at 100% after a year of use. How do you charge your iPhone.
 
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Crowbot

macrumors 6502a
May 29, 2018
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You might want to start a chat with Apple. Since it's under warranty, now is the time to take care of a battery issue.
 
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RickCMC

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Sep 13, 2018
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The battery app is not absolutely accurate.
Wait until tomorrow and when you take it off the charger see what it say then.
If it drops a few more tomorrow, that would be something to get excited about.

The battery on my last two iPhones were still at 100% after a year of use. How do you charge your iPhone.
I never let it go below 20%. Sometimes I even use it while it’s plugged in. I’m just a heavy user though. Probably about 8 hours of “Screen On” battery time each day.
 
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now i see it

macrumors 603
Jan 2, 2002
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there really isn't a conversation (according to Apple) about your battery health until it drops below 80%. So ignore it and check it again next year.
 
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JPack

macrumors 604
Mar 27, 2017
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Well it’s at 92% now and yesterday it was 94 so I have no clue how it could drop 2 percent overnight

The capacity isn't measured every night - it's an average of a number of charge/discharge cycles.
 
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scottcampbell

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Aug 7, 2017
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I would try not to get overly concerned by battery health to the point where you're checking it daily.
Think about all the batteries in your house. Think about the battery in your cars. You don't know their battery health, and it probably doesn't bother you. Ignorance is bliss!
 
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Newtons Apple

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I never let it go below 20%. Sometimes I even use it while it’s plugged in. I’m just a heavy user though. Probably about 8 hours of “Screen On” battery time each day.

If you are as heavy user as you say, you will have more wear on the battery. Not much you can do unless goes below 80%.
 
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RickCMC

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Sep 13, 2018
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I would try not to get overly concerned by battery health to the point where you're checking it daily.
Think about all the batteries in your house. Think about the battery in your cars. You don't know their battery health, and it probably doesn't bother you. Ignorance is bliss!
Haha you are totally right. Before they offered the battery health statistics I never thought twice about my battery health!
[doublepost=1563209816][/doublepost]So I don’t feel as bad because my girlfriend has had her XS for a month less than me and she is already at 90% battery health!
 
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Nacho98

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Jul 11, 2019
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You might want to start a chat with Apple. Since it's under warranty, now is the time to take care of a battery issue.

Unless it's below 80% at a certain cycle count, Apple will tell him to pound sand, so no point talking to Apple.
 
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mikehalloran

macrumors 68000
Oct 14, 2018
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Unless it's below 80% at a certain cycle count, Apple will tell him to pound sand, so no point talking to Apple.
True. That's the warranty point.

Battery health, when it does decline — and they all do — does so in a non-linear fashion.

Checked mine for the first time since new (October 2018). Now down to 95%. I'll be fine.
It’s an estimate. It didn’t actually drop 2% overnight, it was just recalculated. Nothing is wrong.
That, too.
 
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littlemidge

macrumors member
Oct 1, 2018
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75
My battery health was reporting to be 93% and I’ve had the Xs since launch.


Just erased all content and settings, booted back up. Now it’s sitting at 95%. So I’d take these readings with a pinch of salt.
 
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