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Iphone X - Laggy when battery hits 1%

A

alisex747

macrumors member
Original poster
Nov 6, 2017
99
23
Good morning,

I bought the iPhone X last Friday and I noticed something that did not occur on my iPhone 7 : when the battery percentage hits 1%, the iPhone becomes very laggy, as if the processor was underclocked in order to save power.

Please note that I do not use the lower power mode.

Did you notice the same on your iPhone X ? Do you think this normal ?

Maybe this is a new feature on the A11 Bionic chip since it was not the case on my previous iPhone 7 ?

Thank you for your feedback.
 
THank you but did you specifically notice the laggy animations when battery hits 1% ?
 
I did notice this last night. Glad I’m not the only one, however I had low power mode on. I was testing how much battery usage time I could get out of it, it was laggy animations but only at 1%, strange.
 
I noticed this when mine hit 1% the other night. Same thing happens to my MacBook when it is below 5%
 
alisex747 said:
Good morning,

I bought the iPhone X last Friday and I noticed something that did not occur on my iPhone 7 : when the battery percentage hits 1%, the iPhone becomes very laggy, as if the processor was underclocked in order to save power.

Please note that I do not use the lower power mode.

Did you notice the same on your iPhone X ? Do you think this normal ?

Maybe this is a new feature on the A11 Bionic chip since it was not the case on my previous iPhone 7 ?

Thank you for your feedback.
Click to expand...


No never experienced this because I never let my battery go to 1% and then do benchmarking.

But obviously this is a grave problem and you should return the device immediately.
 
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TheSteves said:
No never experienced this because I never let my battery go to 1% and then do benchmarking.

But obviously this is a grave problem and you should return the device immediately.
Click to expand...

I appreciate sarcasm, but he didn't say he was bench marking anything. I had it happen to me too simply setting up my apps. It was jarring.
 
As an aside, running your battery to 1% will eventually shorten its life prematurely. 100% will too. The battery’s life will be longest if you keep it between 40% to 60%. I don’t do that myself, but I keep it in mind when I notice the battery is getting too low and there’s a charger around.
 
03sho said:
I noticed this when mine hit 1% the other night. Same thing happens to my MacBook when it is below 5%
Click to expand...

OK so it seems to be something which is normal.
I also noticed this below 5% of my MacBook Pro
 
My 6splus has always done this.

grinds to a halt.

alisex747 said:
Good morning,

I bought the iPhone X last Friday and I noticed something that did not occur on my iPhone 7 : when the battery percentage hits 1%, the iPhone becomes very laggy, as if the processor was underclocked in order to save power.

Please note that I do not use the lower power mode.

Did you notice the same on your iPhone X ? Do you think this normal ?

Maybe this is a new feature on the A11 Bionic chip since it was not the case on my previous iPhone 7 ?

Thank you for your feedback.
Click to expand...
 
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Well you drained the device to where there was likely a power sag to the processor that created this lag. The processor demands a steady stream of power, at 1% the battery and its circuitry just cannot provide the stable current needed for proper operation.
 
tromboneaholic said:
As an aside, running your battery to 1% will eventually shorten its life prematurely. 100% will too. The battery’s life will be longest if you keep it between 40% to 60%. I don’t do that myself, but I keep it in mind when I notice the battery is getting too low and there’s a charger around.
Click to expand...

not really. it might be showing 1%, but in reality apple won't let the battery run this low. they will turn off the device before this ever happens. it's 1% of the charge they ALLOW you to use.

and can't agree with the 100% either. my macbook is mostly at 100%, since i rarely ever take it off the charger. after 5 years it's still at like 88% capacity.
 
Nozuka said:
not really. it might be showing 1%, but in reality apple won't let the battery run this low. they will turn off the device before this ever happens. it's 1% of the charge they ALLOW you to use.

and can't agree with the 100% either. my macbook is mostly at 100%, since i rarely ever take it off the charger. after 5 years it's still at like 88% capacity.
Click to expand...
My post wasn’t an opinion for you to agree or disagree with.

These are scientific facts backed by tests.

Several stats and statements here to support the facts, starting with:

“A partial discharge reduces stress and prolongs battery life, so does a partial charge.”

“Lithium-ion suffers from stress when exposed to heat, so does keeping a cell at a high charge voltage.”

http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries

There are other articles out there. This was the first one that came up for me on google.
 
Last edited:
Just watched a review on iPhonedo. This low power test is pretty telling.
 

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Yes indeed.

Bottom line is that the CPU may be significantly underclocked when battery is almost empty.

But I agree with your comments, this is quite unusual to wait to hit 1% before charging the device. Actually I did it to have an idea about the battery capacity of the new Iphone.
 
At 1% battery my concern wouldn't be if my phone seemed laggy it would be finding a charger or trying to make the battery last longer.
 
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