iPhone X What the hell is going on with my battery

[Williamgel94]

So yesterday I went to sleep and I checked my iPhone X battery health and it said 100%, today when I woke up I checked it again and it said 97%, so I was wondering how did it decrease so fast overnight when I also own this phone for 2 month, and I never use it while it charges and I never charge it overnight, is my battery defected ?

 

[Txguy82]

3% really? Do u have any apps open or full brightness on overnight?

 

[TheAnvil]

3% really? Do u have any apps open or full brightness on overnight?

Battery health as in capacity / cycles, not the charge level.

 

[Williamgel94]

Battery health not battery charge

 

[synergize]

My X goes down 3% every night in Airplane Mode, and my battery health is 99%. It has done this since day 1, I think this must be normal. All my apps are closed too!

 

[jeyf]

buried in the ios setup there is a page that shows battery usage per app
if your using the mighty lighting hard wire connector:
-clean the contacts
-take a tooth pic and remove the lint from the iPhone side

was that iPhone X expensive?

 

[Newtons Apple]

buried in the ios setup there is a page that shows battery usage per app
if your using the mighty lighting hard wire connector:
-clean the contacts
-take a tooth pic and remove the lint from the iPhone side

was that iPhone X expensive?

Did you read the thread. He is talking about BATTERY HEALTH! Not usage.
[doublepost=1535036317][/doublepost]

So yesterday I went to sleep and I checked my iPhone X battery health and it said 100%, today when I woke up I checked it again and it said 97%, so I was wondering how did it decrease so fast overnight when I also own this phone for 2 month, and I never use it while it charges and I never charge it overnight, is my battery defected ?

I would just keep track of it. 3% is not a big deal, the readings are not that accurate to begin with.

 

[Jimmy James]

Battery health is an estimation of a chemical reaction. It’s not a true meter.

That said, I wonder what triggered such a drastic change.

 

[mtneer]

That goes with how repeatable that battery health indicator is. Gage repeatability & reproducibility is a serious interest for any metrologist.

 

[Williamgel94]

Battery health is an estimation of a chemical reaction. It’s not a true meter.

That said, I wonder what triggered such a drastic change.

I was wondering that myself, I did talk to a friend of mine and he said that after 3 month of use he also had 97%, and now he has his iPhone over six month and the health stayed at 97%

 

[now i see it]

Battery health (as estimated by iOS) is a calculation, a guess. The value show is highly dependent upon the temperature of the battery too. Do a test one day. Put your iPhone (turned off) in a vapor proof zip lock bag and place it in the refrigerator overnight (42° F) then turn it on the next day. Betcha the battery health percentage will change.

I'd give any battery health app, including the native iOS one an accuracy of maybe +-6%.

When it drops below 90% and stays there for weeks, then the battery is worn a little. Anything in the 90s is fine.