Strange battery phenomenon occurred..

flatbacks21

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#1
The other day I grabbed my phone to use and as I unlocked the battery life was at 23%.. About 30 sec later battery literally dropped to 3% and then phone shut down in a matter of minutes.. Not sure what to think, but I hope my battery is okay.. I will see if i can recreate the same conditions and get the drain..


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Europa

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#2
I think the battery is fine. It just needed to be calibrated. Letting it drain down zero and power itself off will calibrate it. It should start reading more accurately now.
 

dmoskaluk

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#3
Does the battery actually have to be drained to nothing ( phone shutdown ) to initiate re-calibration, ? or is a drain down to 'just a bit left ' ie 5% or so then a recharge adequate as a procedure ? I get the heebie-jeebies about dropping right off the scale in a locale where power blackouts are maybe a bit more frequent than in North America, so leave 'that little bit' for either an emergency call, or to advise the Light and Power people that the power is down ....... Call me paranoid, but .... :)


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Dec 15, 2008
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#6
The other day my phone was at 6% then died. A little while later I could turn it on, but then minutes later it fully died. I was upset until an hour later when I made it home. I try to keep it charged all day, but that's hard of course.
 

Europa

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#7
Does the battery actually have to be drained to nothing ( phone shutdown ) to initiate re-calibration, ? or is a drain down to 'just a bit left ' ie 5% or so then a recharge adequate as a procedure ? I get the heebie-jeebies about dropping right off the scale in a locale where power blackouts are maybe a bit more frequent than in North America, so leave 'that little bit' for either an emergency call, or to advise the Light and Power people that the power is down ....... Call me paranoid, but .... :)
To calibrate, it has to drain to zero, power itself down and reboot when you charge it back up.

You can charge it as soon as it dies, so you'll only have a few minutes without your phone.

I do this about once a month.
 

Ledsteplin

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#8
To calibrate, it has to drain to zero, power itself down and reboot when you charge it back up.

You can charge it as soon as it dies, so you'll only have a few minutes without your phone.

I do this about once a month.
Is "calibrate" different from a "maintenance" charge? I didn't know it had to run down to zero. The below 20% thing is what I've read for a maintenance charge.


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Europa

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#9
Is "calibrate" different from a "maintenance" charge? I didn't know it had to run down to zero. The below 20% thing is what I've read for a maintenance charge.
I think you're overthinking this. If your battery accuracy is way off and going from, say, 30% to 10% in just a few seconds, let it drain to zero and shut itself off. I don't do any battery maintenance or try to keep it a certain percentage and not drop too low; I just use the phone and top it off throughout the day when I have access to a charger.
 

Ledsteplin

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#10
I think you're overthinking this. If your battery accuracy is way off and going from, say, 30% to 10% in just a few seconds, let it drain to zero and shut itself off. I don't do any battery maintenance or try to keep it a certain percentage and not drop too low; I just use the phone and top it off throughout the day when I have access to a charger.
I don't have a problem with it. I was just curious if there was a difference in the two. But I think you answered my question. Thanks.


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dmoskaluk

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#11
SO .... ( and this is NOT 'last-word-itis' :) - I'd like some comment ! ) .... Any read of major electronics journals, when on the subject of Li-On 'battery drain', indicate that an occasional drain is good, and might be necessary to optimize stuff, including gauge calibration, BUT that total discharge is a 'no-no' and can damage the battery. Apple engineering, knowing this full well, actually does the actual shut-down at a small percentage ABOVE total discharge, leaving the little bit ( un-indicated, for 'mom and the kids' ) to protect the battery. Thus the only way to totally discharge ( with possible negative consequence ) would be to discharge to shutdown, then leave the phone in that state for quite a while (days....) and a designed in safety margin lies between phone shutdown and totally discharged . That makes sense to me, and is consistent with so many other things engineered into Apple's products, that in the words of Sir Jony, in his iOS 7 intro, talks about good technology being invisible .
Forgive my digress into the term "for Mom and the Kids" .... It was an often used pilots term, for the little 'extra' fuel a Captain would like to carry that was difficult to formally document with a clearly stated reasoning - other than something as such. Any pilot type reviewing a skippers flight plan would understand, many bean-counters and bureaucrats would not. :) David


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Docd

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#12
When the wife and I got our 5s the battery life seemed terrible. I ran them till they powered off and the battery life has been great since.

My brother in-law was complaining about his battery life been bad and was going down to below 20% much faster than his old iPhone but never drained it all they way down. I told him to drain till if powered off a couple time and it been a huge improvement.


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Dec 15, 2008
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#13
When the wife and I got our 5s the battery life seemed terrible. I ran them till they powered of and the battery life has been great since.

My brother in-law was complaining about his battery life been bad and was going down to below 20% real faster than his old iPhone but never drained it all they way down. I told him to drain till if powered of a couple time and it been a huge improvement.


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I am glad to hear about the improvements. I will definitely have to do a battery calibration as they say at least once a month. I notice my iPhone die at weird percentages a lot.

Update: Today my iPhone 5 went from 43 to 23% in a matter of minutes. Wow!
 
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rugved1118

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#14
I think you're overthinking this. If your battery accuracy is way off and going from, say, 30% to 10% in just a few seconds, let it drain to zero and shut itself off. I don't do any battery maintenance or try to keep it a certain percentage and not drop too low; I just use the phone and top it off throughout the day when I have access to a charger.
Hello Europa,
Am really sorry my question might make you all laugh but i would like to know whether it is okay to charge everytime you see a plug point so that you wont drain out completely ? Also, if we do this, wont it harm the battery life ? I keep a practise to charge only once it reach 10%. Please advice !
 
Dec 15, 2008
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#15
Hello Europa,
Am really sorry my question might make you all laugh but I would like to know whether it is okay to charge everytime you see a plug point so that you won't drain out completely ? Also, if we do this, won't it harm the battery life ? I keep a practise to charge only once it reach 10%. Please advice !
I apologize if you don't want others answering, but I'm quick. :)

It's not bad to charge it before it drains out completely. This is completely normal that most people do, including me, but if you start to notice your iPhone or other device shutting off at a high percentage, a calibration may be needed which is where you let it drain down completely on its own.
 

rugved1118

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#16
I apologize if you don't want others answering, but I'm quick. :)

It's not bad to charge it before it drains out completely. This is completely normal that most people do, including me, but if you start to notice your iPhone or other device shutting off at a high percentage, a calibration may be needed which is where you let it drain down completely on its own.
Thanks for the info but am more concerned about anyone answering my query :) Though, the concept of battery calibration after iPhone is drained out totally is new for me, i would like to ask whether this is a standard feature for all mobile phones or is it just the Apple ?
 

Napoleon PhoneApart

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#17
Thanks for the info but am more concerned about anyone answering my query :) Though, the concept of battery calibration after iPhone is drained out totally is new for me, I would like to ask whether this is a standard feature for all mobile phones or is it just the Apple ?
Personally, I think a lot of this battery calibration and maintenance stuff is urban legend, but that's just me...
 
Dec 15, 2008
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#18
Thanks for the info but am more concerned about anyone answering my query :) Though, the concept of battery calibration after iPhone is drained out totally is new for me, I would like to ask whether this is a standard feature for all mobile phones or is it just the Apple ?
In my opinion, it all depends on how one uses and charges their phone. If one charges it at say 50% or even 30, that could cause battery issues in the future. For me today my iPhone died at 13 and then I plugged it in and it started at 12. I read on this forum that a calibration is usually not necessary but once a month. As for other phones, that I am unsure about.
 
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Europa

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#19
In my opinion, it all depends on how one uses and charges their phone. If one charges it at say 50% or even 30, that could cause battery issues in the future. For me today my iPhone died at 13 and then I plugged it in and it started at 12. I read on this forum that a calibration is usually not necessary but once a month. As for other phones, that I am unsure about.
No, that will not cause battery issues. You're perpetuating a myth.
Hello Europa,
Am really sorry my question might make you all laugh but I would like to know whether it is okay to charge everytime you see a plug point so that you won't drain out completely ? Also, if we do this, won't it harm the battery life ? I keep a practise to charge only once it reach 10%. Please advice !
Charge it whenever you want. It really doesn't matter. You don't need to wait until a certain percentage. I've always topped mine off throughout the day. What matters is the overall hours of usage over the years.
 
Dec 15, 2008
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#20
Charge it whenever you want. It really doesn't matter. You don't need to wait until a certain percentage. I've always topped mine off throughout the day. What matters is the overall hours of usage over the years.
Overall hours of usage over the years? So...maybe living with my iPhone 24/7 isn't a great idea. Hehe. :)