99% vs. 100%

trnsilver

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Feb 2, 2008
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#1
When charging my phone overnight, sometimes it does not charge to 100% but rather 99%. This is not a big deal in the grand scheme of things - but I am curious if it speaks to a bad battery or if others have experienced this same thing?
 

Lincoln

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Aug 11, 2007
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#2
I saw this a few times on my V1 when I was jailbroken and had battery percentage enabled - I think disconnecting the iPhone from the dock/cable and then reconnecting it and letting it charge for another minute fixed it.
 

cliffeman

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Oct 13, 2007
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#3
mine has been doing that even before i jailbroke it. I've seen it only charge to 96%. Like Lincoln said, i unplugged it and plugged it back in. Then it fully charged.
 

stevetim

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Jul 20, 2007
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#4
Hopefully it is just the fact that all the cells in the battery aren't fully chargeable...yet. With more use they should all be able to hold a 100% charge because I've seen this a couple times on my 2nd S(went from 16gb to 32gb phone).

Battery life is actually quite good even when it happens.
 

trnsilver

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#5
Yes, battery life is fine. On 3G all day today with Push notifications & 15 min fetch e-mail. Checked about 20 e-mails so far and downloaded an app and at 93%.

No location services, no wi-fi.

Just thought it was weird that it won't go to 100% all the time.
 

debest74

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May 4, 2007
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#6
This was happening 2 with my iPhone and I remembered that this happened with my macbook pro as well. I did a little "research" on google and what i needed 2 do was 2 let the battery go down past 80% or so, then plug it back in a let it charge... i did that and the battery charged fully... i did the same with my iPhone and it worked, my battery charged up 100%
 

p09

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Jun 30, 2009
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#7
Never had this problem with my iPod Touch or my iPhone 3GS. Seems to always charge to 100%. Odd!
 

beautifulliar

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Jun 10, 2007
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#8
It seems to take awhile to jump from 99% to 100%. But, it does fully charge if you leave it charging long enough.
 

HUNTER1

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May 28, 2009
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#9
I had mine like that this morning. It always charged up to 100% and very quick. I thought it was fully charged and I unplugged it, it was only 99% and I thought, what was wrong? I plugged it back in and it instantly said 100% and after few seconds it came down to 99%. I unplugged and plugged it back in and said 100% again and pulled it out. I'm sure it's fully charged and it's holding it's charged very well. I started this morning fully charged, I watched full 2 hour movie and some web browsing and only used 10%. I think that's good.
 

Hawk

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Aug 2, 2007
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#12
On my 3G, (and others have stated this too) I get the plug icon at 99%. It usually takes another 30-50 minutes to charge that last 1%. The closer you are to topping off, the longer it takes to charge.
reboot your phone every 3 days or so, keep the phone topped off as much as you can, and drain to 20% and fully charge once a month and it should be fine.
 

HUNTER1

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May 28, 2009
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#13
You mean rebooting by turning it off completely or how?
 

psylichon

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Oct 31, 2007
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#14
This is why I turned off battery %. I don't think that anomaly indicates anything other than the fact that it's difficult to precisely pinpoint the actual charge of a battery, and offsets are likely to occur.
 

HUNTER1

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May 28, 2009
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#15
You're right. I had this turned off until I decided to watch how this function works, one less thing to worry about.
 

trnsilver

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Feb 2, 2008
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#17
Mine was at 100% this morning. Turned off my alarm and checked one e-mail and it was at 99%.