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Mar 8, 2014 1:12 PM in response to gaberdine macby deggie,And if you read through all the threads on this matter from 2 years ago you would have seen that people asked this question and several people did tests (not just one person, and I also did some at my former employers shop) that do not agree with the findings you are getting.
This would normally get people to check their work and their equipment rather than post this as a fact. You could have read that no one had corroborated your findings.
The responsible thing would have been to read those tests here, as well as at other sites/labs on the web, and determine something was awry with your findings.
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Mar 8, 2014 1:12 PM in response to TJBUSMC1973by gaberdine mac,TJBUSMC1973 wrote:
You didn't use a proper testing procedure.
You can't use a non-approved, third party charging system and make any claims about the charging system.
- I never said it was non-approved.
- I also used an approved Apple iPhone adapter and observed the difference
- The charging system IS IN THE PHONE - the adapter is just a constant voltage source.
- The current draw is entirely determined by the iPhone internally. If you don't understand that point we have nothing more to discuss.
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Mar 8, 2014 1:16 PM in response to TJBUSMC1973by gaberdine mac,TJBUSMC1973 wrote:
It's like asking if it's okay to use two different brands of gasoline in a Dodge Magnum, but then you step in and say that you've tested with a fuel that isn't approved for use in a Dodge Magnum, something you created on your own, and there's a problem.
Sigh. No it isn't. Go read up on constant voltage sources.,
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Mar 8, 2014 1:18 PM in response to deggieby gaberdine mac,deggie wrote:
And if you read through all the threads on this matter from 2 years ago you would have seen that people asked this question and several people did tests (not just one person, and I also did some at my former employers shop) that do not agree with the findings you are getting.
And were those tests all carried out on an iPhone 4s running iOS7 ...? Oh I see.
Not neccessarily relevant then.
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Mar 8, 2014 1:21 PM in response to gaberdine macby deggie,The version of iOS would have no bearing on these tests.
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Mar 8, 2014 1:25 PM in response to gaberdine macby TJBUSMC1973,gaberdine mac wrote:
TJBUSMC1973 wrote:
You didn't use a proper testing procedure.
You can't use a non-approved, third party charging system and make any claims about the charging system.
- I never said it was non-approved.
- I also used an approved Apple iPhone adapter and observed the difference
- The charging system IS IN THE PHONE - the adapter is just a constant voltage source.
- The current draw is entirely determined by the iPhone internally. If you don't understand that point we have nothing more to discuss.
gaberdine mac wrote:
I have measured an iPhone 4s drawing 1.7A charge current at 5.2V from a plug adater (not Apple but a good make, designed for iPhone, rated at just 1.2A)
What is the brand, make and model of the charger that you used?
What is the brand, make and model of the meter that you used?
When was the last time the meter was calibrated?
What known-good test sources were used to establish a proper baseline for the meter?
I've probably got voltmeters in my garage older than you, so forgive me if I hestitate to take your 'analysis' over that of Apple's engineers & designers.
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Mar 8, 2014 1:31 PM in response to deggieby gaberdine mac,No Deggie I did not. Yes, it would have given stronger evidence but I only posess the one and it seems to reflect the expected difference between various USB power souirces (other than charging iPhones) quite accurately so it makes a pretty good ballpark starting point and, as I have stated before is 100% repeatable.
The fact that there is a major discrepamcy between the Apple iPhone charge and the non-Apple (apparently) iPad charger in terms of charge-current is sufficient to flag this an an anomaly requiring further investigation and cuation when considering using iPad adapters with iPhones.
...And when the posts I checked, some of which were 2 years old, advise that it is guaranteed absolutely safe to use an iPad charger with an iPhone - and part of that justifictaion is that the iPhone will never draw more than 1A - and there are newer phones and news iOS than when this was last a hot topic.... well, sure I post an alert.
And to quote my earlier post:
'I don't claim my experience applies to all iPhones but I do stand by my claim that it applies to some. Whether I have a faulty iphone/firmware or there is a wider issue affecting a certain number of iPhones, I cannot say. But if the general question is "is it safe to use an iPad charger on an iPhone?" I will always advise the cautionary approach and say "no - not neccessarily". '
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Mar 8, 2014 1:33 PM in response to gaberdine macby deggie,You either have a faulty meter or every phone you have tested is faulty. I'm leaning towards the meter.
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Mar 8, 2014 1:35 PM in response to gaberdine macby TJBUSMC1973,gaberdine mac wrote:
The fact that there is a major discrepamcy between the Apple iPhone charge and the non-Apple (apparently) iPad charger in terms of charge-current is sufficient to flag this an an anomaly requiring further investigation and cuation when considering using non-Apple iPad adapters with iPhones.
Fixed that for you.
Provide your feedback to Apple at www.apple.com/feedback. I'm sure they're waiting anxiously for your test results.
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Mar 8, 2014 1:35 PM in response to TJBUSMC1973by gaberdine mac,TJBUSMC1973 wrote:
1. I've probably got voltmeters in my garage older than you,
2. so forgive me if I hestitate to take your 'analysis' over that of Apple's engineers & designers.
- Not relevant and almost certainly not true unless you are an antiques dealer in which case.. oooh it's still not relevant
- You are forgiven.
- I'm ging to bed - let's reconvene when Lawrence Finch has some results
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Mar 8, 2014 1:37 PM in response to gaberdine macby deggie,So which model meter are you using? We know what Lawrence used.
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Mar 8, 2014 1:37 PM in response to gaberdine macby TJBUSMC1973,Ah, I see you dodged the questions regarding your testing equipment. I'm not exactly surprised.
Basic science requires that results be obtained under controlled circumstances, and yield duplicatable results. Your inability to to obtain results under controlled circumstances, combined with your refusal to support your findings with something as basic as your testing equipment and conditions simply compounds the hypothesis that your findings are completely erroneous and invalid.
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Mar 8, 2014 1:47 PM in response to gaberdine macby Lawrence Finch,gaberdine mac wrote:
a) I am not alone in suspecting fast-charging of reducing battery life.
The are all anecdotal. And there are dozens of variables that can affect battery life. No one who has posted this claim has controlled all of those other variables, or even some of them. You will find just as many possible guesses as to what reduces battery life as charging with an iPad charger. If you were to rank them this one would be at the bottom of the list, or close to it. This one, with 12,000+ posts:
iPhone 4s Battery Life? is at the top of the list, and its wrong also.