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Can use ipad charger to charge iphone?

494724 Views 342 Replies Latest reply: Sep 10, 2013 3:00 PM by ronhenderson2 RSS Branched to a new discussion.
  • Michael Superczynski Calculating status...
    Currently Being Moderated
    Jun 15, 2013 7:07 PM (in response to monkeyhead0305)

    How's that tin foil hat?

    You really think that Apple, the world's most successful company, would stoop to nickel and diming customers over battery replacement revenue?

  • modular747 Level 6 Level 6 (15,680 points)
    Currently Being Moderated
    Jun 15, 2013 7:10 PM (in response to Michael Superczynski)

    No, but posting that drivel gets more of a response than anything else he can do in his life.  Adhere to the recent FCC ruling which bans troll feeding...

  • monkeyhead0305 Calculating status...
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    Jun 15, 2013 9:20 PM (in response to modular747)

    who said it's nickel and dime? You you guys have too much faith... it's business, hope ur  battery lasts forever

  • gail from maine Level 6 Level 6 (10,040 points)
    Currently Being Moderated
    Jun 15, 2013 9:30 PM (in response to monkeyhead0305)

    Well, as I said somewhere around a billion posts ago.....I've been charging my iPhone 4 with my iPad charger for the last 5 years and 10 months, and the battery is still going strong.

     

    Also, my tinfoil hat has prevented me from being coerced into replacing my iPad 1 with a newer iPad model, but, I did purchase a Macbook Air. I don't think this was a defect in my tinfoil hat, however, since I did not have a previous Mac laptop (or desktop, for that matter - I used my husband's Macbook Pro until I got my own - so I don't think that counts).

     

    Do you think it is real? Or is it Memorex?

     

    GB

  • monkeyhead0305 Level 1 Level 1 (0 points)
    Currently Being Moderated
    Jun 15, 2013 9:50 PM (in response to gail from maine)

    wow, that's amazing, billions of posts ago, do you get much sunshine, hun ? time for a new hat

     

    It may be real or maybe the Matrix, only you know ..wink wink

  • nlongo64 Calculating status...
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    Jun 27, 2013 9:56 PM (in response to Lawrence Finch)

    .......think I'm crushing on Lawrence Finch.     

  • ActionJunky Calculating status...
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    Jul 15, 2013 6:37 AM (in response to emfung)

    I have read half of the posting on this subject and I do have an engineering degree  But, let's be honest... the engineering degree means nothing if you do not understand how a device works.  It seems logical that the charging circuit is in the device and controls the allowable amount of amperage.  However, we do not know that the allowable amount of amperage needed is equivalent to what is listed on the power supply. 

     

    In other words, the iPhone charger is capable of 1A maximum.  But, it is possible that the Phone will allow 1.8A (an arbitrary number).  If that is the case, then the battery life will be dimished by constant quick charging.  Every battery retains best charging performance when it is occasionally slow charged.  Constant quick charging will diminish the life.  So what is the end result?

     

    I was looking to purchase a car charger that would be sufficient for all devices.  I spend a good deal of time in the car, so I will be using the charger quite a bit.  I was considering a charger with dual 2.1A ports.  Based on my findings here, I will be getting a dual charger, 2.1A on on port and 1.0A on the other port.  This will allow me to charge the devices in their intended amperages.

     

    Thank you all for the information.  I know this is an old thread, but I hope my analysis helps someone seeking the same answer as I.

  • Lawrence Finch Level 7 Level 7 (24,495 points)
    Currently Being Moderated
    Jul 15, 2013 7:20 AM (in response to ActionJunky)

    Your analysis does not contribute any useful information. APPLE states that the 2.1 amp charger is compatible with the iPhone. Unless you are into conspiracy theories and believe that Apple says this so they can sell more batteries, that should be sufficient.

     

    As an engineer you know (I hope) that the current supply capability of a power source only limits the maximum current that can be drawn from the source. Each device connected to the source only draws what it needs. That's why you can have a 200 amp panel for your incoming power, but not instantly blow all of the lightbulbs in the house.

     

    You may have also missed the post that links to a video of someone actually measuring the power consumed by an iPhone being charged. As an engineer I hope you believe in actually measuring, and not just hypothesizing. The video shows that the iPhone consumes 5 watts when connected to a 1 amp (5 watt) iPhone charger, and also consumes 5 watts when connected to 2.1 amp (10.5 watt) and 12 watt iPad chargers. Here's a link to the video: http://www.youtube.com/watch?v=DC4gPxc89Wg

     

    I also did my own measurements, although not as precise. I charged my iPhone from a known state of charge (20%) to 100% using the iPhone charger. During the high current charge cycle I measured the temperature of the phone with a laser thermometer after 30 miutes. I repeated the test using the 10 watt charger. The charge times were the same, to within a few minutes, and the temperatures were likewise.

     

    Ahh, nearly forgot to mention that I have been charging my iPhone 4S with a 10 watt Apple power source for the past 18 months, with no issues.

  • Michael Superczynski Level 5 Level 5 (7,095 points)
    Currently Being Moderated
    Jul 15, 2013 7:29 AM (in response to Lawrence Finch)

    This thread is16 pages of much ado about nothing.

  • ActionJunky Level 1 Level 1 (0 points)
    Currently Being Moderated
    Jul 15, 2013 8:50 AM (in response to Lawrence Finch)

    I reviewed this thread, Lawrence, to make a decision about a car charger, dual 2A ports or one with 2A and 1A.  I admit that I did not find the Youtube video and I agree that is seems the internal charging circuit does limit wattage.

     

    Still a slow charge from a USB cable connected to a PC, every so oftern is likely to extend the life of the battery. 

    So in the end, I saved $10 and I can only recharge 1 iPad at a time in my vehicle.  The world did not come to an end.  I understand Ohm's law, but not everyone does.  The purposes of discussions like this is to help one another find information that may not be readily available. 

     

    Thank you for the YouTube link, but you hostility is not needed, nor is it intimidating.  Try being helpful, not a know-it-all.

  • gail from maine Level 6 Level 6 (10,040 points)
    Currently Being Moderated
    Jul 15, 2013 9:59 AM (in response to ActionJunky)

    Hi ActionJunky,

     

    I would suggest that you post your findings in a separate thread with the specific titling that your response refers to. This thread is about charging a phone with an iPad charger.

     

    Since your post is specifically addressing your findings concerning car chargers, and you hope it that they will help someone looking that kind of information, I can promise you, they won't find it buried here. Nor would they even look here to see if that kind of information was contained somewhere in this rat's nest of nattering negativity, misinformation, indignity, and refusal to acknowledge actual results which, in some cases, go all the way back to January of 2010....

     

    So, since you put in the effort, why not make it useful to others who may be looking for just that information!

     

    Cheers,

     

    GB

  • Motovet Calculating status...
    Currently Being Moderated
    Jul 18, 2013 1:40 AM (in response to emfung)

    Wow, curious I am about the original question. Then reading on about engineers, degrees or PHD's, whatever... I was sucked in to who's right or wrong and how they can prove it. The way some of you elaborate on, or justify why and how your correct as to the function of the two chargers in question is interesting. Honestly, I only read about half the thread, that's all I could handle. I just want to share my personal experience with the 5w charger vs the 10w charger on my old iPhone 4. Clearly the 10w charger does charge faster and generates some noticeable heat. The 5w charger does its job, taking longer. I charge my phone every night on a 5w charger, by noon the battery is down to 50% or less, by the time I get home from work, the phone is almost dead. This is when I reach for my 10w charger, knowing it will charge fast. From my personal experience, I think the 10w charger has shortened my batteries lifespan. The phone is over 2 years old and should be replaced anyway. Currently I now have a charger in nearly every room of my house. Personally I am waiting for the next phone to be released in a few months, once I have that, I'm going to stick with just the 5w charger. The iPad mini came with a 5w charger (not a 10w), the 10w is old, dated, discontinued, and bad for an iPhone. (My opinion).

    I live on the west coast in the Silicon Valley (where Apple was founded), and I'm just a measly electrical contractor. All the formulas your rattling off about current, demand, resistance, Ohm's law - whatever, is interesting to hear from your doctorate or engineering perspective. The fact is, nobody cares. There was initially a simple question that needed a simple answer.

    Apple wants us to continue emptying out our pockets for the next device, these things aren't designed to last for decades. Use whatever charger suits your needs, slow, fast, 10w, 5w, warm, not so warm. Who cares? Use it up to its full capability then throw it away and go buy a new one. That's what I do.

    The 3ph 240v questions what's his name was asking about - I'd be happy to answer, and have questions for him. Otherwise, hope sharing my experience helped someone somewhere.

    Cheers

  • Motovet Level 1 Level 1 (0 points)
    Currently Being Moderated
    Aug 1, 2013 1:32 AM (in response to Lawrence Finch)

    Wow, curious I am about the original question. Then reading on about engineers, degrees or PHD's, whatever... I was sucked in to who's right or wrong and how they can prove it. The way some of you elaborate on, or justify why and how your correct as to the function of the two chargers in question is interesting. Honestly, I only read about half the thread, that's all I could handle. I just want to share my personal experience with the 5w charger vs the 10w charger on my old iPhone 4. Clearly the 10w charger does charge faster and generates some noticeable heat. The 5w charger does its job, taking longer. I charge my phone every night on a 5w charger, by noon the battery is down to 50% or less, by the time I get home from work, the phone is almost dead. This is when I reach for my 10w charger, knowing it will charge fast. From my personal experience, I think the 10w charger has shortened my batteries lifespan. The phone is over 2 years old and should be replaced anyway. Currently I now have a charger in nearly every room of my house. Personally I am waiting for the next phone to be released in a few months, once I have that, I'm going to stick with just the 5w charger. The iPad mini came with a 5w charger (not a 10w), the 10w is old, dated, discontinued, and bad for an iPhone. (My opinion).

    I live on the west coast in the Silicon Valley (where Apple was founded), and I'm just a measly electrical contractor. All the formulas your rattling off about current, demand, resistance, Ohm's law - whatever, is interesting to hear from your doctorate or engineering perspective. The fact is, nobody cares. There was initially a simple question that needed a simple answer.

    Apple wants us to continue emptying out our pockets for the next device, these things aren't designed to last for decades. Use whatever charger suits your needs, slow, fast, 10w, 5w, warm, not so warm. Who cares? Use it up to its full capability then throw it away and go buy a new one. That's what I do.

    The 3ph 240v questions what's his name was asking about - I'd be happy to answer, and have questions for him. Otherwise, hope sharing my experience helped someone somewhere.

    Cheers

  • DashingDaveASC Calculating status...
    Currently Being Moderated
    Aug 2, 2013 10:19 PM (in response to emfung)

    Here's the definitive word, straight from Apple, as to what iphones and ipads can be used with which power adapters:

     

    http://support.apple.com/kb/HT4060

  • gail from maine Level 6 Level 6 (10,040 points)
    Currently Being Moderated
    Aug 2, 2013 10:30 PM (in response to DashingDaveASC)

    Good job, DashingDaveASC! I'd not seen that article before, so very handy to have for when the next time this question comes up (which it inevitably does)....

     

    Thanks!

     

    GB

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