Charging iPad overnight

Discussion in 'iPad' started by virginblue4, Jun 25, 2012.

  1. virginblue4 macrumors 68000


    Apr 15, 2012
    United Kingdom
    I know the batter trickle charges, so you shouldn't be able to ovecharge and cause damage to the battery. However, I was just reading an article and number 5 states "Do not overcharge iPad. Overcharging iPad by leaving it charging for the whole night shortens the battery lifespan."

    Is this true? I charge my iPad overnight every nigh as I use it a lot duing the day and I am now worrying about reducing the battery lifespan.

    Any help?

    Here is the article:
  2. basesloaded190 macrumors 68030


    Oct 16, 2007
    With no sources to prove otherwise and from what looks to be like a no-name website, I wouldn't worry about charging it overnight.
  3. iAmYou macrumors 6502


    Jun 29, 2010
    It is not possible to over charge an iPad or iPhones battery.
    It charges to 100% then stops.
  4. LostSoul80 macrumors 68020


    Jan 25, 2009
    Nothing to worry about, as long as you don't always keep your iPad connected. But that's only because these batteries love some fun, refreshing moves.
  5. AndyCarolan macrumors member

    Jun 25, 2012
    I wound imagine that as the iPad knows when it is fully charged, it will automatically regulate the incoming charge to prevent overcharging.
  6. Iwolf macrumors newbie


    Jun 24, 2012
    Gunshine state
    I allways leave my phone and pad charging over night have not noticed any issues
  7. Julien macrumors G4


    Jun 30, 2007
    If you overcharge any lithium battery it will overheat and burst into flames. :eek: Since they don't catch on fire that MUST mean you CAN'T overcharge them because of the built in control circuits. ;)
  8. 3dflyboy1, Jun 25, 2012
    Last edited: Jun 25, 2012

    3dflyboy1 macrumors 6502

    Jun 27, 2011
    California, USA
    I've had this happen to me! Not fun. Of course, it wasn't a battery in an electronic device. It was a lithium-polymer 3s 2100mAh that was charging at its maximum rate of 2.1A. :rolleyes:

    I don't know if lithium-ion batteries have the same problem, but I'm sure none of us want our idevices going up in flames! :)
  9. spiderman0616 macrumors 68040


    Aug 1, 2010
    This may have been a problem with battery technology about 25 years ago, but that is no longer the case. You are expected to leave the iPad on a charger overnight--for better or worse, it was designed that way.
  10. Julien macrumors G4


    Jun 30, 2007
    Yes all Lithium based are this way. An analogue:

    Nickel based batteries are like a sold metal can. You fill them up and when you get to the top it will hold no more. Also you can (and should) empty them all the way.

    Lithium based are more like a balloon. You add air until you reach a safe (monitored) point and quite. If you keep adding air it will continue to expand until it burst (into flames). Also much like a balloon you don't empty them completely are they will never except a charge again. Like a flat balloon is harder to blow up than one that has some air in it.
  11. BluePhoenixRa macrumors regular

    May 19, 2012
    The only reasons I can think of are:
    1: The person had the battery changed from some other company. I don't know if that's possible, but if it is, then the quality of battery put in there must've been poor.

    2: Used another charger, that is not by Apple, to charge the iPad.

    Other than that, no reason they should over charge and blow up, if everything is by Apple.
  12. Julien macrumors G4


    Jun 30, 2007
    Doesn't matter because all wall wart's are dumb. The control circuits are in the device.;)
  13. spiderman0616 macrumors 68040


    Aug 1, 2010
    LiON batteries do not need to be emptied all the way to stay functional. You're thinking of the old nickel batteries that had a "memory". If you charged them to full all the time and never let them drain, they would develop a memory for the minimum amount of battery that you thought was too low, and they would learn that as "dead". Modern day LiON batteries do not do this. You can charge them as much as you want. Apple suggests letting them go completely dead once a month, probably just to lengthen the overall life of the battery a little bit. Charging is, in the end, what puts all the wear and tear on a battery.
  14. BluePhoenixRa macrumors regular

    May 19, 2012
    I've had times when I used someone else's charger at school, and my device got really hot really fast..and they said it wasn't Apple charger. Could've been the outlet then I guess. Meh. Thanks for the info. xD
  15. takeshi74 macrumors 601

    Feb 9, 2011
    No. As always, consider the source. Corroborate.

    You completely misread the post you quoted. The post said do not full discharge Li ion.

    Though that analogy is terrible. Deflated balloons can be inflated again.
  16. reppans, Jun 25, 2012
    Last edited: Jun 25, 2012

    reppans macrumors member

    Dec 2, 2006
    I've done a lot of research on Li-ions with the internet battery gurus and there's some very simple charging practices that you can employ to get it to last significantly longer if you want, depending on what your average daily usage is. First to clarify some myths..

    It is true that you will not overcharge (or overdischarge) a Li-ion. To charge above 4.2V, or for that matter discharge below some number, I think 2.7V, starts to destabilize the battery chemistry and creates a serious potential for explosion or flame venting. As you can imagine, manufacture's will avoid this at all costs and so smart circuits exist to prevent this from happening.

    There really is no need to fully cycle a Li-ion as it has no memory effect as previous battery chemistries. However, manufacturers recommend doing this periodically because you are constantly losing some capacity (the battery is wearing) from day 1, and the internal battery meter needs to be "reset" for this. Nobody like it when their device shuts down with 20% remaining on the meter.

    From the evidence I've seen, after high temperatures, the second highest stress factor for a Li-ion is high voltage (or 100%/4.2V charge). The greater the % of time the battery reaches and sits at this level, the faster the battery will capacity will be lost. Of course the battery is designed to handle this, and the manufactures' charge cycle quotes account for this, but the point is, if you terminate charging at 90%/4.1V instead, you can double the number of charge cycles, not to mention that you will retain a higher capacity for longer into the batteries' life.

    So for simple good charging habits, I merely use a light timer set to terminate charging at 80-90% (based on my best guess) and just before I wake up and start using the device so as to minimize the time it sits at relatively high voltage. It only adds a few seconds a night to the charging routine and should preserve the battery well into years 4-6 when it will be in the hands of my kids, if nothing else, as toy.

    This is good for further reading...

    Having said all that, spending a few extra seconds at night, or leaving the house with 10-20% less capacity, is often considered too much for a device that will likely be obsolete and replaced in a couple of years anyways.... I don't disagree, but I tend to use my stuff way longer than the average consumer.
  17. Perene macrumors 6502a


    Jun 29, 2015
    This is the sort of thing that no one reached a consensus, however I now started avoiding this, for a change, because I don't feel 100% sure that leaving the iPAD plugged to eletricity for 8 hours/day and in each day isn't going to be detrimental to the battery's health.

    I remember that some people suggested to let the iPad battery drain until it shuts itself off, then charge it fully, to calibrate, at least once every month, something like that. Then other sources pointed this also shortens the lifespan of the battery, and it's even mentioned in that article.

    I suspect that it might not even be bad to charge overnight, in ideal conditions. However, we all know this isn't what happens 100% of the time (I mean the electric charge which flows into our houses).

    I used to let the iPAD charging before going to bed, now I simply changed this to let it for at most 2 hours before leaving my house in the morning, around 9 AM.
  18. Aluminum213 macrumors 68040


    Mar 16, 2012
  19. Kal-037 macrumors 68000


    Apr 7, 2015
    Depends on the day, but usually I live all over.
    I once asked Apple if I could leave my iPad connected to the charger non-stop and they said "yeah, it won't hurt the battery or the iPad in any way."

  20. A.R.E.A.M. macrumors 6502

    Nov 12, 2015
    Los Angeles, California
    purchased my 13 inch pro in november on launch day. i plug it up every night and on the weekends its plugged up 3 days back to back. same for the pencil.

    these batteries have monitoring circuits to shut off charging when cells are full, heat, or any combination thereof. i also use Anton Bauer batteries (some are in similar battery chemistry as the ipad) in my production gear and they are RECOMMENDED to leave on the tap (charger) indefinitely until used.

    my daily use. your mileage may vary.
  21. Newtons Apple macrumors Core

    Newtons Apple

    Mar 12, 2014
    Jacksonville, Florida

    You need to pick a better place to get you information from. You can leave your iPad on charge for days and it will not hurt it. When charged it simply stops charging the device. Maybe days later when the battery falls a little from full the charger will kick in and charge it to full again.

    No harm is done.
  22. bufffilm Suspended


    May 3, 2011
    You don't need to do all that...

    / shrug/
  23. fricotin macrumors 6502

    Sep 26, 2011
    Puerto Escondido, Oaxaca, Mexico
    Mine has been plugged in 90% of the time for the last two years, I use it among other things as an alarm clock, I discharge it completely once a month, It still holds the charge fine.
  24. joeblow7777 macrumors 603

    Sep 7, 2010
    I only just realized that this thread is originally from 2012. 4 years later and people are still confused about how Li-Ion batteries work.

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26 June 25, 2012