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Battery charging slow on iPhone 6

akash.nu

macrumors G3
Original poster
May 26, 2016
9,375
11,044
So as some of you may recall, I got the battery replaced by Apple on my iPhone 6 due to bad battery life and today I've started noticing it seems to be charging really slow.

In the last 2 and half hours the battery charged up by 22%. That's too slow isn't it?
 

elf69

macrumors 68020
Jun 2, 2016
2,333
489
Cornwall UK
my 6s plus is slow to charge.

im using a 2a samsung mains to usb adaptor from my S7 edge.

the apple charger says 1.2a so I would have thought it charge faster on the samsung.
It's not quite as slow as yours but alot slower than the S7 edge.
 
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akash.nu

macrumors G3
Original poster
May 26, 2016
9,375
11,044
I've never seen it charge this slow before to be honest and I'm charging from my Mac right now that outputs at 900 mA as far as I remember.

Edit - so according to Apple I'm supposed to get the max output from the USB3 port which would be 2900mA. That's similar to using an iPad charging brick I think.

https://support.apple.com/en-gb/HT204377
 
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Newtons Apple

Suspended
Mar 12, 2014
22,757
15,231
Jacksonville, Florida
I've never seen it charge this slow before to be honest and I'm charging from my Mac right now that outputs at 900 mA as far as I remember.

Edit - so according to Apple I'm supposed to get the max output from the USB3 port which would be 2900mA. That's similar to using an iPad charging brick I think.

https://support.apple.com/en-gb/HT204377

If you have an iPad charger, it will charge quicker. I just charge mine over night and never have to worry about the speed of charging.
 
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akash.nu

macrumors G3
Original poster
May 26, 2016
9,375
11,044
I generally charge overnight as well but it seem to have drained faster today probably because I was using it outside so the screen brightness killed it.
 
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Relentless Power

macrumors Nehalem
Jul 12, 2016
35,148
37,443
It seems somewhat slow to charge at that rate. But I don't think it's
Completely abnormal at that rate. If it worsens, then hopefully, at minimum Apple could provide you with a battery replacement.
 
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akash.nu

macrumors G3
Original poster
May 26, 2016
9,375
11,044
It seems somewhat slow to charge at that rate. But I don't think it's
Completely abnormal at that rate. If it worsens, then hopefully, at minimum Apple could provide you with a battery replacement.
It has started after a battery replacement anyway, so hopefully I'm still within the replacement part warranty that comes with it.
 
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zhenya

macrumors 604
Jan 6, 2005
6,782
3,432
Did you have to do a restore or anything of your data recently? If it's attached to your computer and only providing 900mA then it's conceivable that if the phone is busy with a lot of background processes and/or the screen is also on that it is only providing a small amount of current to charge the battery after it first powers the phone.

This seems like the most reasonable explanation.
 
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akash.nu

macrumors G3
Original poster
May 26, 2016
9,375
11,044
Did you have to do a restore or anything of your data recently? If it's attached to your computer and only providing 900mA then it's conceivable that if the phone is busy with a lot of background processes and/or the screen is also on that it is only providing a small amount of current to charge the battery after it first powers the phone.

This seems like the most reasonable explanation.
No if you read the edit bit, it's supposed to provide the max over USB 3.
 
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zhenya

macrumors 604
Jan 6, 2005
6,782
3,432
No if you read the edit bit, it's supposed to provide the max over USB 3.

I read that page to indicate the maximum is 1100mA over USB 3. Not enough to charge at full rate if the device is consuming power at the same time. Follow the instructions on that page to find out how much it is providing.
 
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bhayes444

macrumors 6502a
Jul 13, 2013
772
291
I read that page to indicate the maximum is 1100mA over USB 3. Not enough to charge at full rate if the device is consuming power at the same time. Follow the instructions on that page to find out how much it is providing.
Yes, from what I read on that page the maximum output it can provide is 1100mA provided it meets certain conditions: 1) it is an Apple computer or display capable of doing so (there is no list), 2) the computer or display is awake, 3) the iPhone is connected directly to the computer (no hub), 4) it is the first Apple device requesting additional power (some computers/displays can have more than one port with additional power), and 5) the device actually needs it at that time (not on trickle charge). Otherwise the USB port will put out 900mA max.
 
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akash.nu

macrumors G3
Original poster
May 26, 2016
9,375
11,044
Yes, from what I read on that page the maximum output it can provide is 1100mA provided it meets certain conditions: 1) it is an Apple computer or display capable of doing so (there is no list), 2) the computer or display is awake, 3) the iPhone is connected directly to the computer (no hub), 4) it is the first Apple device requesting additional power (some computers/displays can have more than one port with additional power), and 5) the device actually needs it at that time (not on trickle charge). Otherwise the USB port will put out 900mA max.
Yes and my situation satisfied all of those conditions. I was charging it from my Mac directly using an authentic Apple cable when the phone was at 20% charge. There wasn't any other device connected with the Mac.
 
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bhayes444

macrumors 6502a
Jul 13, 2013
772
291
Yes and my situation satisfied all of those conditions. I was charging it from my Mac directly using an authentic Apple cable when the phone was at 20% charge. There wasn't any other device connected with the Mac.
Yeah, Apple probably needs to look at it then. That sucks you've had two potentially bad batteries. Heck, quote that article if the store folks have any questions.
 
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zhenya

macrumors 604
Jan 6, 2005
6,782
3,432
Yes and my situation satisfied all of those conditions. I was charging it from my Mac directly using an authentic Apple cable when the phone was at 20% charge. There wasn't any other device connected with the Mac.

There's nothing wrong. 1100mA is not enough to charge the phone very fast if it is being used in any way.
 
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akash.nu

macrumors G3
Original poster
May 26, 2016
9,375
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There's nothing wrong. 1100mA is not enough to charge the phone very fast if it is being used in any way.
I hope so. Wasn't using the phone per se but some processes must be running.
 
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BigMcGuire

Contributor
Jan 10, 2012
6,830
8,463
the Alpha Quadrant
Correct me if I'm wrong but, I believe the "rapid" charging started with the iPhone 5s - being able to charge at greater than 1a. My 6s+ loves my Anker batteries and Anker wall/car chargers that do 3.8+amps. Definitely charges significantly faster than the iPhone 1a power brick that comes with the phone.

Going from x-70% is rocket fast, then it slows down 80-90, and 90-100% can take some time (slows way down for this). coconutBattery app on Mac shows it trickle charges down to even 100mAh from 90-100%.


2 1/2 hours to 22% is INSANE, I'd find that slow for even a 500mah power brick (assuming the phone's screen is off).

Even with my Chinese no-name cable that barely does 1a, my iPhone 6s+ and iPad Mini 4 will charge much faster than that.


What would I do if that happened to me? Hold Power + Home and restart phone. Plug it in, turn screen off, flip phone face down, and check it again in 20 mins - see if that helps. If not, I'd take it to Apple.

Charging via my Macbook Air 11 (Early 2015) is very fast.
 
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C DM

macrumors Sandy Bridge
Oct 17, 2011
51,388
19,428
Correct me if I'm wrong but, I believe the "rapid" charging started with the iPhone 5s - being able to charge at greater than 1a. My 6s+ loves my Anker batteries and Anker wall/car chargers that do 3.8+amps. Definitely charges significantly faster than the iPhone 1a power brick that comes with the phone.

Going from x-70% is rocket fast, then it slows down 80-90, and 90-100% can take some time (slows way down for this). coconutBattery app on Mac shows it trickle charges down to even 100mAh from 90-100%.


2 1/2 hours to 22% is INSANE, I'd find that slow for even a 500mah power brick (assuming the phone's screen is off).

Even with my Chinese no-name cable that barely does 1a, my iPhone 6s+ and iPad Mini 4 will charge much faster than that.


What would I do if that happened to me? Hold Power + Home and restart phone. Plug it in, turn screen off, flip phone face down, and check it again in 20 mins - see if that helps. If not, I'd take it to Apple.

Charging via my Macbook Air 11 (Early 2015) is very fast.
I believe it was as of iPhone 6.
 
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zhenya

macrumors 604
Jan 6, 2005
6,782
3,432
Correct me if I'm wrong but, I believe the "rapid" charging started with the iPhone 5s - being able to charge at greater than 1a. My 6s+ loves my Anker batteries and Anker wall/car chargers that do 3.8+amps. Definitely charges significantly faster than the iPhone 1a power brick that comes with the phone.

Going from x-70% is rocket fast, then it slows down 80-90, and 90-100% can take some time (slows way down for this). coconutBattery app on Mac shows it trickle charges down to even 100mAh from 90-100%.


2 1/2 hours to 22% is INSANE, I'd find that slow for even a 500mah power brick (assuming the phone's screen is off).

Even with my Chinese no-name cable that barely does 1a, my iPhone 6s+ and iPad Mini 4 will charge much faster than that.


What would I do if that happened to me? Hold Power + Home and restart phone. Plug it in, turn screen off, flip phone face down, and check it again in 20 mins - see if that helps. If not, I'd take it to Apple.

Charging via my Macbook Air 11 (Early 2015) is very fast.

It was the iPhone 6 that first was able to take advantage of higher current chargers, as stated.

There is nothing wrong with his phone! The rate of charge with a 1a or less charger is completely dependent on how heavily the phone is being used. If it's busy with background processes or the screen is on, that will consume most of the available power from the charger because power is first used to power the phone. Anything left over goes to charge the battery.
 
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akash.nu

macrumors G3
Original poster
May 26, 2016
9,375
11,044
It was the iPhone 6 that first was able to take advantage of higher current chargers, as stated.

There is nothing wrong with his phone! The rate of charge with a 1a or less charger is completely dependent on how heavily the phone is being used. If it's busy with background processes or the screen is on, that will consume most of the available power from the charger because power is first used to power the phone. Anything left over goes to charge the battery.
The only issue is that the phone wasn't being used at that time. I hardly use my phone for that high intensity work.
 
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