Battery Level Reading

Discussion in 'iPad 3 Forum' started by AQ_OC, Mar 21, 2012.

  1. AQ_OC

    AQ_OC
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    I have my iPad New set to display a number representing the charge-level of the battery.

    I was just using it downstairs and noted the level was at 97 %. I was getting ready to step out, so I decided to top it off right quick while I get ready. As soon as I plug it in to power, the reading jumps to 100%. Unplug it, back go 97%. Plug it in again, 100% again. Unplug, 97. Plug in one more time, 97% and charging.

    What gives?

    And my iPad is NOT overheating or getting hot. :)
     
  2. Skull One

    Skull One
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    LOL... That is a neat feature of iOS 5.X. If the charging circuit determines you are within X percentage of full charge, it doesn't kick into Stage 2 or Stage 3 charging. It simply goes to Stage 4 charging which is a top off low current charge.

    Same thing happens on the iPhones.
     
  3. AQ_OC

    AQ_OC
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    Oh...ok...that's good to know...stage 4 charging...thanks. :)
     
  4. Skull One

    Skull One
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    There is actually a pretty detailed specification for 4 stage and 3 stage charging of Lithium-Ion batteries. The 4 stage version really protects the anode from plating. Between that and one of the three chemical variations, you can get over 500 full cycle charges out of a battery. Which is pretty impressive considering we started out at below 300 just a few years ago.
     
  5. grouchomarx

    grouchomarx
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    Thanks for the info. I get everything except it being a "neat" feature. What is so neat about it? 5% being 5% but if I want to be on the road and that 5% may give some peace of mind...
     
  6. Skull One

    Skull One
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    It is neat because it protects the anode of the battery from plating. This means a much longer battery life for the consumer.

    But I will agree it is annoying that there isn't a better way to communicate this to the consumer.
     
  7. grouchomarx

    grouchomarx
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    Okay, I take the explanation.

    I can also see people's eyes rolling when they hear this anode plating thingin...
     
  8. Skull One

    Skull One
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    No doubt. No one should have to learn chemistry to use a dang cell phone or other portable device.
     
  9. AlexisW

    AlexisW
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    So, how long should an iPad last with the original battery? Is there a point that the battery will become useless?
     
  10. Skull One

    Skull One
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    Don't quote me on this, but I believe the battery setup in the iPad (1st Gen) and iPad 2 are both rated for 400 full cycle charges and still able to maintain 80% original capacity. So lets say you recharge it every day from 40% back to 100%.

    400 charges * 100% = 40000%
    40000% / 60% (per day) = 667 days or 1 year and 10 months roughly.

    Now the odds of the average user doing that is pretty slim. That is why 2 to 3 years is the more commonly thrown around number.

    With my iPad 2, I recharge every other day when it finally hits 40%. So for me that would be 3 years and 8 months roughly.
     

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