Battery Maintenance

Discussion in 'iPad General Discussions' started by TFarmer, Sep 10, 2010.

  1. TFarmer

    TFarmer
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    Just got an iPad Monday. Should I let the battery run down before charging in or can I top it off each night? Which way will make it last longer and hold its charge longer down the road?
     
  2. pallentx

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    The last thing I read about Li Ion batteries said that the worst thing you can do for them is to keep them at 100% all the time. You dont need to drain them, in fact draining them completely can reduce life. They do recommend draining them once a month or so, however, because it resets the mechanism that tells you how much power you have left in your battery.
     
  3. DM51

    DM51
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    The battery in the iPad is a Lithium Polymer (LiPo) Lithium Ion battery, using Lithium Cobalt (LiCo) chemistry. These batteries have no memory effect and can be topped up as often as you like. You will not decrease battery life by doing so.

    The battery will have ~1,000 charge/discharge cycles in its life, but partial charge/discharges do not count as full cycles, so in practice you may well be able to recharge it >2,000 times, i.e. every day for 6+ years. That's about as long as modern LiIon/LiPo batteries are likely to last anyway, so you need have no fear of causing a problem with daily recharging.

    These batteries are better kept topped up rather than empty. If you do happen to run the battery down to empty, this won't damage it as long as you recharge it as soon as possible afterwards.

    If you need to store the iPad for an extended period (say 1 month) do so with the battery indicator between 50-80% full.

    You'll know if you start getting a problem with the battery - it will no longer hold a full charge. The state-of-charge indicator will drop within ~30 minutes of charging, even when the iPad is switched off. When it drops from 100% to 80% in 30 mins unused, its useful life is effectively over. By that stage you should notice the iPad overheating while charging, which is not a good sign. But that is a long way off for all of us... :)
     
  4. Lost1592

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    Have a read of the apple website for the batteries (can't post link until I get my post count up haha, but just google "iPad battery apple" and it will come up)

    Just try to keep the temperature around room (21C) and don't physically damage it. Don't leave it on charge for more than 4 hours at most (usual charging time from about 8%) and don't leave it dead for days on end.

    The whole myth about having to run the battery down before charging doesn't apply to the iPad. It's for the previous generation. Like the old mobile phones and stuff. Not quite sure of the names or chemicals that they used. The iPad does not suffer from a memory battery issue which I would find very annoying if it did.

    Just follow apples tips and advice and you should get along fine. Like pallentx said "draining them down once a month" (100% to dead null) will let the iPads system calibrate for any changes to the battery state and help you get a more accurate reading from the meter.

    It will charge faster if you don't use it while charging. Seems obvious but it's tempting. It's much better than a laptop on your bed haha (which I'm totally not doing at the same time)
     
  5. Bluesjam

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    I get two evenings easy from one charge, if it's above 60% I go another day.
     
  6. Hasty

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    Thanks for the info Lost.
     
  7. cmalinowski

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    Wow, I can go all weekend for the most part (day and night). Granted, that's not continuous use, but picking it up all the time and checking mail and such. Playing games. I do have my brightness set to zero--which seems to start at 50% for some reason. But so far, my battery has been stellar.
     
  8. TFarmer

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    Lost, I do not see anywhere where it says not to charge for more than 4 hours. Can you point me to where it says that? Thanks.
     
  9. Lost1592

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    trip

    That's not an apple thing Im just going by experience from my last laptop. I charged that baby for hours and hours and it eventually just died. Like 10 mins bat life haha. I don't think it would hurt to have it on longer, it's just I prefer to keep charge times to a minimum. Stops parts heating up as well.

    Again I doubt it would hurt if u need to keep it on longer.
     
  10. kierandill

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    Another factoid I've read about LiIon batteries is they lose approx 10% capacity per year, whether you use them daily or they are sitting in a package on a store shelf.
    i.e., the battery that lasts 10 hours new will only last 9 hours a year later, and so on.
     

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