Previous 1 7 8 9 10 11 Next 342 Replies Latest reply: Sep 10, 2013 3:00 PM by ronhenderson2 Go to original post Branched to a new discussion.
  • deanbayley Level 1 Level 1 (0 points)

    Wow what an amusing thread, almost as funny as the time my mother-in-law went round our new house switching off the sockets, when I questioned what she was doing she said "The electricity still comes out even if nothing is plugged in you know!"


    Alas some people will never get it..


    I think we create a video: charging an iphone from a 300 amp power supply 5v power supply, that should shut em up!



  • Bass12 Level 1 Level 1 (0 points)

    I started Charging my 4s  using my ipad 3rd Gen charger, Its about twice as fast in charging time, and now my battery is draining much quicker in just 10 days of using this charger.


    I started using my USB from my notebook again and hope the battery lasts as long as it oce did.


    In short nothing is for free here, faster charging equates to less battery usage, its from eperience and not a degree in Electrical Engineering.

  • modular747 Level 6 Level 6 (18,235 points)

    Absolute nonsense.  Repeated objective testing with measurements show no significant difference in iPhone charging time using the iPad AC adaptor compared to the iPhone AC adapror (or properly functioning USB port). If your phone actually does this, there is a serious defect in the charging circuit in the phone. 


    OTOH, charging from your notebook may be excessively slow if it can't supply 1 amp.  Even so, there is no difference in battery capacity if the charging cuircuit is working properly.


    Your "experience" does not trump objective testing.  Testimonial "evidence" is worthless and misleading.

  • Bass12 Level 1 Level 1 (0 points)

    This thread seems to be very sensitive in whos reporting what, I tell you again, my iphone 4s charges at a much faster rate on the ipads charger then it does on the laptops USB port. I had this 4s for quite sometimes and after noticing the difference using the ipads charger I had to google it which I found this thread. 

  • rfn_4 Level 1 Level 1 (0 points)

    You are being ridiculous, i am sorry to say.




    Bass12 wrote:

  iphone 4s charges at a much faster rate on the ipads charger then it does on the laptops USB port. ........



    Of course your iphone4 charges faster with the iPad charger compared to charging with your laptop USB port.



    Your iPhone 4 needs 1.0A to charge optimally.


    Your laptop USB port will probably provides only 500ma, or 0.5A.


    (I must say some laptop computers are capable of providing 1.0A by updating its BIOS )


    The iPad charger, capable of providing up to 2.1A, will have no problem supplying 1.0A.



    As a result, using your laptop USB port to charge your iPhone4 will take about twice longer than you using iPad charger.

  • rfn_4 Level 1 Level 1 (0 points)

    I agree with the statement that using iPad charger will take same time as using the iPhone charger.




    We seriously need MORE RESULTS from verified, objective testing....



    Simply insisting "Oh, I used both charger and you know what? iPad charge seems to be charging faster!! "



    Unfortunately, I only have an iPhone 3gs, but not an iPad...


    Can someone who has both iPad and iPhone carry out this "simple" test? All you have to do is measure the exact time.


    1. Start chargint at same battery % level.


    2. Close all application and kill all background processes.


    3. Use your stopwatch, or anything that is quite accurate, to measure the exact time it takes to charge fully.



    I don't really care if the side I am supporting is right or wrong....


    I just want to see some solid test results that can back up either side of this argument...

  • David.Hergert Level 1 Level 1 (0 points)

    Holy cow, will this thread please die?  Have you read this ridiculously, unecessarily long thread that contains the results you asked for?  This has been done and mentioned on this thread, here ( and here (



    iPhones SHOULD charge at the same rate, whether you use the iPhone charger or iPad charger.  Neither SHOULD do damage to your phone's battery. If you use a PC USB, it will charge slower if its a 0.5 amp port.  If you experience different results, it could be due to variances or defects in the charging mechanism of your individual phone.


    Are we done?

    (The frustration was not directed personally at you rfn_4, its just that this thread needs to be closed).

  • DACCG Level 1 Level 1 (0 points)


    First of all I would like to apologise for the offtopic comment I am going to write, but I really think only people with the enough knowledge (and it's being seen that here there are a few) are going to be able to answer (and hopefully explain shortly) my two short questions.


    1. Can counterfeit cables affect the charging rate of the device? I am asking this because I think they actually do, but haven't made my own 'strict' experiment since many factors can modify the result. If so, why this might happen? Does Apple 'put' something 'special' in their cables?


    2. I also bought one 9 feet cable for using my phone while in bed (the power plug is far away from the head of the bed, and I use my phone as an alarm clock) and with this cable I have noticed that the charging process of my iPhone 4S is significantly slower than the 'original' cable. As a science (not Engineering tho) student I guessed that this might happen due to the length of the cable and its quality (probably way less conductive material than in the original, therefore thinner inner cable segment) which can affect the final voltage that 'arrives' to the charging device (for getting to this conclusion I just took the fact that high voltages are used to transport 'huge amounts' of electricity because it's more efficient, thus using 'just' 5v (and in combination with poor quality cable) for 9 feet could make a noticeable difference, am I correct?


    Thank you very much for your attention and looking forward to see the answers of the expert people that had commented previously in this thread!

  • Lawrence Finch Level 7 Level 7 (33,370 points)

    1. Cables that do not conform to the Apple spec probably won't work at all (and will display an error dialog on the phone - "Charging is not supported with this device", but I can't see any reason they should reduce the rate of charge. However, using the phone while charging will reduce the rate of charge. The amount of the hit depends on what you are doing with the phone at the time.


    2. A longer cable will have higher internal resistance, but unless the individual wires in the cable are very thin it should not have a measurable affect on rate of charge. Try measuring the cable resistance with an ohm meter or multimeter. The current should be 1 amp, so the voltage drop will be essentially be the resistance of the cable (E = I*R, and I is 1). Note that the resistance will probably be way less than 1 ohm, so a sensitive meter is required. The thing is that a USB cable not intended for charging can get away with a a higher resistance, so if it hs that kind of a cable it could cause problems.

  • Bass12 Level 1 Level 1 (0 points)

    Ill take ridiculous over its my imagination, thank you for confirming.  Tested again today its exactly that, twice as fast, not sure what all this fuss is about in this thread and all these Electronic Enginneers irate as its not something they have been taught or something not matching to what they have been taught. If they even are EE. Pathetic at best here.

  • benbrancaerre Level 1 Level 1 (0 points)

    Hi David and everyone,


    thanks to all of you for helping try to solve some customers' problems.

    I do not write very often and have very limited knowledge on the issue so I apologise if what I write my hurt somehow somebody's sensitiviy.


    I have recently bought a new iPad mini and before charging it I wanted to be sure what to do since the the guy at the shop told me "never charge an iPad with an iPhone adapter but it's ok to charge an Iphone with an iPad adapter". After having read half of the internet I decide to ask the advice of an Apple advisor.


    It turns out that they don't know much about it. I asked him if I could charge my iPad with my iPhone's 5V charger and if I could charge the iPhone with the new 12W charger. His first answer has been: 


    - First off the iPhone 3G uses a 10V charger.  Don't use a 12V on it because we don't want to risk frying it.  As for the iPad mini I'm taking a look to see if a 10V will fry it.  Bare with me about 2 or 3 minutes please. [...] obviously 5v will charge slower then 10 or 12v.  But whatever you do don't use a 10v or a 12v with that mini.


    He also told me: to be sure follow this link iPad: Charging the battery

    So I told him: If this is the case why is apple selling this adapter saying is good for the mini?


    His answer was:


    - Awesome.  Looks like we have a new adapter to handle the voltage variances and can detect it.  If you are getting that specific adapter then according to the tech spec it will work.  It doesn't have the model on there to compare with the models that are on that page.  It looks like it's different but as long as we sell it and it says right on the sales page will work with the mini then it will work with the mini.  What I'll do is pass that reference article up to clarify it a bit as it is a bit confusing. The sales page supersedes my articles since not every article gets updated immediately.  Our page does clearly state that all the 5w adapters are compatible with the mini.  It looks like we have a new 12v that will work too.  I don't think you should be concerned with charging it if you are 100% certain the adapter is a 5w adapter.



    So I now turn out to you. I have an iPhone 3gs and an iPad mini. Can i bloody charge them with the same adapter, i.e. the A1399 model, the last one on this link iPad: Charging the battery.


    I am exhausted! Argh!


  • Lawrence Finch Level 7 Level 7 (33,370 points)

    What you heard is absolute BS. There has NEVER been a 10 v charger for any iPhone. From the 3G forward it has always been a 5V USB power source (NOT a charger, which is built into the source); the original iPhone would charge with either a 5V USB power source or a 12V Firewire power source. The 3G, 3GS, 4, 4S and 5 will not charge with a Firewire source, but won't be damaged by it either, because the 12V was on a different pin from the 5V USB source. If you try to use a Firewire charger (or an older iPod dock) you will get a dialog saying that charging is not supported with that accessory.

  • benbrancaerre Level 1 Level 1 (0 points)

    Ok good to know, thanks!


    Now, will charging my Mini with the 5w adapter screw the battery as the sales assistant (the clerk) said ("Never charge an iPad with an iPhone charger") or I can go safe? I know apple provides it and I don't care if is good to charge with the 12w or not. I just want to know if it will compromise the Mini's battery to charge it with the 5w or you would recommend buying the 12w adapter.


    Thanks a lot

  • HyperNova Software Level 6 Level 6 (8,530 points)

    The iPhone/iPod Touch/iPad chargers can be used interchangeably.

    Some charge faster, some charge slower.

    If it's an Apple product AND Apple charger, it's all good.

  • Quanfu Level 1 Level 1 (0 points)


    Theoretically and technically the ipad charger will charge iphones compatibly and scientifically sound (EE aspects). However, experimentally and hard evidences have shown that using ipad charger on iphones for some time have caused issues with the battery. My iphone's battery now only charged up to 95% max. So it might be related to several factors: heat caused by ipad charger, wear and tear of current regulator of my iphone or string theory or others... Try it on your iphone for some time and you will see...

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