By Michiel

2012-03-14 11:24:45 8 Comments

I want to buy an iPad charger for in my car. I have one now for my iPhone, but he won't charge my iPad. I know batteries use mAH to denote capacity, so are chargers rated by mAH or some other measure?

What kind of specifications do I need to charge my iPad in my car at a normal speed (equal when connecting to the power network).


@Max Ried 2012-03-14 12:00:24

The original Apple charger has an output limited to 2.1 A at 5.1 V.

I occasionally charge my iPad 2 Wifi with the old charger of my passed Palm Pre. It provides an amperage of 1 A at standard 5 V USB voltage.

I don't know if you can go even lower than 1 A, but the standard USB amperage of .5 A is not enough to charge it. It shouldn't be a problem to get a car charger that is capable of handling 1 A, more is better.
Make sure you buy one, that is capable of charging an iPhone as Apple devices tend to observe the USB standards and try to communicate with the charger. Some dumb China elcheapo chargers may not have USB logic inside and your iDevices could refuse to charge.

@bmike 2012-03-14 17:39:31

To confuse things, iPhone and iPod touch chargers in the US are rated at 5W and iPad chargers are rated at 10W. I believe it delivers 2 A at 5 V in case that helps you select an auto charger that meets similar amperage and voltage.

@Max Ried 2012-03-14 18:45:20

To make it even more confusing, the 10 W iPad charger is no 10 W charger, but a (2.1 A * 5.1 V =) 10.71 W charger...

@ughoavgfhw 2013-09-25 17:54:01

You have the voltage wrong in the first line.

@ken 2013-09-25 17:35:24

My Iphone 4 is drawing 288 mA now while it is being charged and has been drawing that amount of current for the last hour. I have it connected to a power supply that displays the current draw. Of course I connected the power supply to a car 12 volt to iphone adapter

@bmike 2013-09-25 17:46:05

Let's see if we can find an iPhone question or perhaps you could explain how you measured this. It's not really an answer to this question - but could be with some edits.

@Michiel 2012-03-14 12:17:53

Apparently 2,1A should suffice to charge an iPad since Apple sells a similar product in his online store.

Did You Notice? Two USB ports with 2.1 amp output allow for the fastest possible simultaneous charging of your iOS devices.

@stuffe 2012-03-14 12:06:03

A standard USB charge should be enough to charge it, albeit very slowly. It's important to note on a very low charge like this, often it will provide enough to either a) charge when the screen is of, or b) not charge but allow enough to run it without any change in charge levels. In this mode, the charging indicator will always show not charging, as by definition you cannot see it when the display is turned off, but it can happily be charging while you are not using it.

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