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Q: can i charge iphone with ipad charger

can i charge iphone with ipad charger?

iPhone 3G, iOS 5.1.1

Posted on Oct 26, 2012 5:15 PM

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Q: can i charge iphone with ipad charger

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  • by gaberdine mac,

    gaberdine mac gaberdine mac Mar 8, 2014 11:41 AM in response to deggie
    Level 1 (30 points)
    Mar 8, 2014 11:41 AM in response to deggie

    Lawrence Finchwrote: "It will charger faster than a computer USB port, but not faster than the 5 W iPhone charger, because the charging circuit in the phone will limit the charging current to 1 amp."

     

    Now THAT information is "just plain wrong".

     

    Perhaps it is just out of date, I don't know - but all the more reason to correct a theoretical statement with empirical observations. If it is wrong, I am trying to set it right (and that's just what you are all doing too, after all).

     

    Look, if somebody searches for an answer on this topic, as they should, they deserve to know that I and others have found that the iPhone can draw a charging current higher than 1A and that, in our opinion, this seems to have damaged the battery life. I don't care how old the thread is if it deals with contemporary issues. Get over it!

     

     

    Look, I just tested 3 iPhones: a 4 on iOS7, a 4s on iOS7 and a 4s on iOS6

     

    All of them showed around 1.7A charge current with the more powerful charger. Remember, it is just a 5v source - the charging circuitry is inside the iPhone, the current is controlled by the phone. Now, I don't claim that my USB power meter is the best calibrated device in the world, but when you compare that with relative charge currents of around 0.7A with a lower rated USB charger you have to suspect that this 1A limit is simply not being applied by the iPhone charging circuitry.

     

    So, at the very least there are some phones that DO draw higher than 1A.


    Maybe they are all in Europe, maybe they were all made in February, maybe you have magic hands and can heal iPhone batteries with one touch, I really don't know and I really don't care. But don't tell me I am plain wrong because I am not. You don't have to take my advice - that's OK. You can refute my testing by saying it's simply impossible and you'd be in very good company. Read Kuhn if you don't know what I'm on about. Being challened is good and healthy. Sticking your head in the sand and singing the company song is not.

     

    And FWIW I don't know a single iPhone 4s owner in the UK who doesn't think the battery life stinks and always did from week1. I know iPhone 5 users with dreadful battery life that Apple refuses to replace in warranty because the battery was "worn" - whatever that means. Does Apple get everything right? Sheesh!

  • by TJBUSMC1973,

    TJBUSMC1973 TJBUSMC1973 Mar 8, 2014 11:58 AM in response to gaberdine mac
    Level 5 (7,626 points)
    Mar 8, 2014 11:58 AM in response to gaberdine mac

    TL;DR

  • by gaberdine mac,

    gaberdine mac gaberdine mac Mar 8, 2014 12:18 PM in response to TJBUSMC1973
    Level 1 (30 points)
    Mar 8, 2014 12:18 PM in response to TJBUSMC1973

    Your loss. Start at the top.

     

    Or don't - I don't really care.

     

    I'm not posting here to change the thinking of people who are determined to disagree at any cost.

     

    If you want to learn something, read my post. If you don't, have a pleasant evening.

     

    But if somebody else has this question, they might benefit from it, even if you don't.

  • by stevejobsfan0123,

    stevejobsfan0123 stevejobsfan0123 Mar 8, 2014 12:20 PM in response to gaberdine mac
    Level 8 (43,542 points)
    iPhone
    Mar 8, 2014 12:20 PM in response to gaberdine mac

    No one benefits from false information.

  • by TJBUSMC1973,

    TJBUSMC1973 TJBUSMC1973 Mar 8, 2014 12:24 PM in response to gaberdine mac
    Level 5 (7,626 points)
    Mar 8, 2014 12:24 PM in response to gaberdine mac

    I read your first few posts, which made it clear you had no true understanding of what you were doing.  You used a non-Apple charger for your tests.  Therefore, there is no control in your tests.

     

    You're trying to row up a waterfall with a leaky canoe and a broken paddle.  Do some proper, controlled tests with legitimate equipment, and then you might have something.

  • by gaberdine mac,

    gaberdine mac gaberdine mac Mar 10, 2014 8:07 PM in response to gaberdine mac
    Level 1 (30 points)
    Mar 10, 2014 8:07 PM in response to gaberdine mac

    Please note, I now retract the above claim that using a higher rated adapter charges the iPhone faster or adversely affects the battery. That was complete baloney. My tests were flawed.

     

    The iPhone limits the charging current to the optimum level.

     

    Please see this and the following post for full retraction, apology and explanation

    https://discussions.apple.com/thread/5820603?start=45&tstart=0

  • by mrlawrencelam,

    mrlawrencelam mrlawrencelam Mar 22, 2016 11:56 AM in response to Lawrence Finch
    Level 1 (0 points)
    Mar 22, 2016 11:56 AM in response to Lawrence Finch

    You wrote an article at Everything you wanted to know about charging your iPhone or iPad . Theoretically this is a great article and I know many people in internet thank you for your explanation. Unfortunately you missed out something - the facts!

     

    You said:

    If it takes your iPad charger (2.1A) 5 hours to charge up your iPad with the iPhone charger (1.0A) it will take 10 hours to charge it because it is about 1/2 the watts and amps.

    I did a lab test using a current meter and it showed that you were wrong about the statement above.

     

    When you charge an iPad Air with an iPad charger (2.1A), the current flowing into the iPad is NOT 2.1A. You will get not more than 1.6A when your iPad's battery is almost flat to half full. But you assumed that the current is 2.1A. The iPad charger is just a transformer and techinically it shouldn't be called a charger. The actual charger is residing in your iPhone/iPad and it is the one that is regulating the power. I do not know why, but the iPad Air is only allowing less than 1.6A entering it (and not 2.1A).

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