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Old Jun 29, 2010, 09:45 AM   #1
Reiger
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Is it safe to use an iPad charger to charge the iPhone 4?

I'd like to use an iPad charger to charge my new iPhone 4. However, only if this won't damage the iPhone. I know that the iPad charger provides more power, so this will charge the battery faster. Is this harmful? Both chargers have the same USB connection.

I can't find any Apple Support page about this issue. Using Google I can only find people who want to use an iPhone charger to charge the iPad, which is ok but slow. Both the iPhone 4 and the iPad are not yet for sale in the Netherlands, so calling Apple didn't work.

I hope someone with the same issue, can help me
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Old Jun 29, 2010, 10:16 AM   #2
androidpopjr
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On apples website it says the charger works with all ios items. I've done it since April, and nothing bad has happened to me.
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Old Jun 29, 2010, 10:27 AM   #3
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I've used it with my 3GS and never a problem
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Old Jun 29, 2010, 10:29 AM   #4
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Should be fine. I use my iPhone charger for all Apple products I have.
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Old Jun 29, 2010, 10:30 AM   #5
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Short answer, Yes. I use my iPad charger for my iPhone and all my iPods, no problems at all.
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Old Jun 29, 2010, 10:31 AM   #6
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The iPad charger has a higher output wattage (I think 10 watts) due to the iPad having hefty charging requirements. However it is perfectly fine to use the iPad charger with iPhone. If anything it'll likely charge the phone a bit faster.
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Old Jun 29, 2010, 10:34 AM   #7
jdong
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Yes, it is! In fact it's safe to use the little iphone charger to charge the iPad too. If you take apart the charger, you'll notice there's a USB controller in there. The chip negotiates the maximum safe current with the device.
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Old Jun 29, 2010, 10:42 AM   #8
matt15f
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I do it all the time, and it does seem to charge the iphone faster than the iphone charger.
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Old Jun 29, 2010, 01:24 PM   #9
Reiger
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Great! Thanks for all the replies!
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Old Jun 29, 2010, 01:26 PM   #10
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I just wish Apple would have made the iPhone 4 fit into the iPad dock, like the 3GS does.
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Old Jun 19, 2011, 12:57 AM   #11
sithbrach
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Let's look at the relevant science.

Ohm's Law: http://en.m.wikipedia.org/wiki/Ohm%27s_Law

http://en.m.wikipedia.org/wiki/Volt


That tells us what the 5v x 1 or 2A translates to. It would indicate that twice the wattage is coming out of the iPad charger (W=V*A) and twice the current (I=V/R).

As I understand it, the block acts as a transformer: http://en.m.wikipedia.org/wiki/Transformer

So, it takes the 120V*15A=1800W power from the outlet and converts that power so that it will be transmitted at a much lower rate, giving the device less of that wattage.

I'm not sure if the earlier post by someone was trying to say that the iPhone has a particular resistor of it's own and so any different level and rate of power would simply dissipate, but wouldn't that still be stressful on that resistor?

I think, in the end, one would be better off spending the couple of bucks for an iPhone charger.

If there was absolutely no difference, then why would they make different chargers with different values? There would only be a need for stronger chargers for larger, more powerful devices, but the inverse (using that more powerful charger for a smaller, less powerful device) wouldn't make any sense.

Just use the corresponding charger.
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Old Jun 19, 2011, 04:00 AM   #12
mortenandersen
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Back to the first question, please!

Quote:
Originally Posted by sithbrach View Post
Ohm's Law: http://en.m.wikipedia.org/wiki/Ohm%27s_Law

http://en.m.wikipedia.org/wiki/Volt


That tells us what the 5v x 1 or 2A translates to. It would indicate that twice the wattage is coming out of the iPad charger (W=V*A) and twice the current (I=V/R).

As I understand it, the block acts as a transformer: http://en.m.wikipedia.org/wiki/Transformer

So, it takes the 120V*15A=1800W power from the outlet and converts that power so that it will be transmitted at a much lower rate, giving the device less of that wattage.

I'm not sure if the earlier post by someone was trying to say that the iPhone has a particular resistor of it's own and so any different level and rate of power would simply dissipate, but wouldn't that still be stressful on that resistor?

I think, in the end, one would be better off spending the couple of bucks for an iPhone charger.

If there was absolutely no difference, then why would they make different chargers with different values? There would only be a need for stronger chargers for larger, more powerful devices, but the inverse (using that more powerful charger for a smaller, less powerful device) wouldn't make any sense.

Just use the corresponding charger.
Back to the first question again, please: Is it safe to use an iPad charger to charge the iPhone 4?

This last post above is confusing in the light of all the contrary experience from the other posts.

Last edited by mortenandersen; Jun 19, 2011 at 04:05 AM.
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Old Jun 19, 2011, 04:03 AM   #13
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Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_3 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8J2 Safari/6533.18.5)

Yes it is safe. If u buy an iPad charger from apple the box states it's for the iPad iPod and iPhone.
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Old Jun 19, 2011, 07:47 AM   #14
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IS it safe to necro year old threads?
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Old Jun 19, 2011, 08:03 AM   #15
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Quote:
Originally Posted by pyro008 View Post
IS it safe to necro year old threads?
Actually it is, in fact its better to update an old thread then create yet another new thread on the same subject
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Old Jun 19, 2011, 08:08 AM   #16
Blinny83
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Seems like my iPhone charges a bit faster with the 10 watt iPad charger. The reason for different chargers is obvious if you've ever tried to charge an iPad with an iPhone charger or a USB port though.
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Old Jun 19, 2011, 08:17 AM   #17
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Quote:
Originally Posted by Gav2k View Post
Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_3 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8J2 Safari/6533.18.5)

Yes it is safe. If u buy an iPad charger from apple the box states it's for the iPad iPod and iPhone.
It also tells you the same thing on the Apple Store.

It even has a nice picture just to make sure.

Click image for larger version

Name:	Screen shot 2011-06-19 at 14.14.14.png
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Old Jun 19, 2011, 09:16 AM   #18
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Quote:
Originally Posted by Reiger View Post
I'd like to use an iPad charger to charge my new iPhone 4. However, only if this won't damage the iPhone. I know that the iPad charger provides more power, so this will charge the battery faster. Is this harmful? Both chargers have the same USB connection.

I can't find any Apple Support page about this issue. Using Google I can only find people who want to use an iPhone charger to charge the iPad, which is ok but slow. Both the iPhone 4 and the iPad are not yet for sale in the Netherlands, so calling Apple didn't work.

I hope someone with the same issue, can help me
I was skeptical at first.. because of some bad reviews I read. But one day I had no other charger except my iPad charger. It works. Charges just as fast.. or faster (I'm not sure). Using it right now, actually. haha.
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