iPhone XS Max Battery health increased by 2% after reset

[Aljon]

Hello guys, Got my iPhone XS Max
4 months and 22 days old. So my last seen on my battery health is already 98% and then i did a Reset which is the "Erase All Content And Settings" After setting up the Phone. I checked my Battery Health percentage and it came back to 100%. What's going on? Anyone experienced or already happened to anyone? Is this normal? Or there's something wrong with the phone?

-Cheers to all 🍻

 

[aakshey]

Battery Health is a guess. A very bad one. So this can happen sometimes.

 

[AppleHaterLover]

Yeah that thing is a guesstimation at best.

It'll tell you when the battery is ****, but until it gets there...

 

[DevinNj]

Like said above, don't take what the percentage reads as gospel. It has been discussed here how a reset can change the readings. As long as your phone performs as needed, you're fine. I've never once looked at my battery health on my XS Max, couldn't care less. It does what I need it to do, so I'm fine with that.

 

[now i see it]

My battery health gauge on my 7 jumps all over the place and I didn't reset anything. It's not a reliable indicator of anything

 

[revmacian]

My battery health gauge on my 7 jumps all over the place and I didn't reset anything. It's not a reliable indicator of anything

After learning more about iPhone batteries, it looks like that percentage remaining readout in the control center isn't completely reliable either. I'm guessing battery life readouts aren't an exact science.

 

[DevinNj]

I'm guessing battery life readouts aren't an exact science.

Agreed! It's not an accurate representation, I take it with a grain of salt myself

 

[C DM]

Battery Health is a guess. A very bad one. So this can happen sometimes.

It's an estimate based on various factors. While certainly not exact or anything, not sure if it's somehow "a very bad one".

 

[aakshey]

It's an estimate based on various factors. While certainly not exact or anything, not sure if it's somehow "a very bad one".

Sometimes the health can be a lot worse than it indicates. And sometimes the health can be slightly better than it indicates.

 

[C DM]

Sometimes the health can be a lot worse than it indicates. And sometimes the health can be slightly better than it indicates.

For the most part it seems to be in that potentially "slightly" off category given that it's an estimate.

 

[aakshey]

For the most part it seems to be in that potentially "slightly" off category given that it's an estimate.

My dad’s SE health was less than 50% and it said 90%+.

 

[C DM]

My dad’s SE health was less than 50% and it said 90%+.

What was less than 50% based on?

 

[aakshey]

What was less than 50% based on?

It used to drain 20% in like 15 mins of Safari.

 

[C DM]

It used to drain 20% in like 15 mins of Safari.

Well, I'm not sure that shows that it's under 50% per se. It also appears to be more of an isolated anecdotal experience that doesn't necessarily mean that the battery health estimate is essentially not functional overall.

 

[aakshey]

Well, I'm not sure that shows that it's under 50% per se. It also appears to be more of an isolated anecdotal experience that doesn't necessarily mean that the battery health estimate is essentially not functional overall.

Even according to Coconut it was in its 60’s and used to vary a lot.

My previous iPad Pro used to vary from low 70’s to mid/high 80’s in Coconut. Acc to Apple it is at 93%. And it lasts half of what it used to last when new. Maybe less than that.

Apple’s diagnostic means nothing.

My aunt’s SE was at 85%. It used to keep shutting down every 5 mins. And would go from 100% to 20% in minutes. Got a fresh battery, and it was as good as new.

My mom’s 7 is at 94%. It drains 1% every 1-2 mins. Just basic usage.

 

[Jimmy James]

As others have said it’s a guess. There is no sensor that measures the internal chemical reaction within the cell.

 

[C DM]

My aunt’s SE was at 85%. It used to keep shutting down every 5 mins. And would go from 100% to 20% in minutes. Got a fresh battery, and it was as good as new.

There are other factors in play when it comes to batteries beyond capacity, which this basically what that battery health is measuring.

Apple’s diagnostic means nothing.

There might be noticeable discrepancies in various cases, for one reason or another, but it seems that overall it's still a fairly reasonable estimate of capacity.

 

[Minorite]

I would recommend tracking charge cycles with iMazing or CoconutBattery (both free for this feature) and change it after around 600 cycles. They also report more accurate battery health.

 

[now i see it]

Ummm, my battery has 1271 load cycles on it and it's no where near needing to be replaced.
I think the best way to determine when a battery needs to be replaced is you notice it doesn't last very long at all and it- dies quickly

 

[Puppuccino]

You should ignore the percentage until you get your first ‘unexpected shutdown’ and then you need to take notice and possibly get the battery replaced.