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This question already has an answer here:

I just bought iPhone5S. While I need converter to use iPhone5S charger, instead I am using an iPad2 charger.

Is it OK if I do that? What's the different (in terms of voltage, ampere, and so on) of iPad2 and iPhone5S charger?

marked as duplicate by nohillside Apr 29 '14 at 8:24

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As you can see from Apple's product page for the 12W USB Power Adapter, it's compatible with iPhone 5S. The output voltage is the same in both, except the 12W adapter gives a higher amperage (2.4A instead of 1A), but your phone can regulate it's intake.

I use my iPad Air's charger occasionally with my iPhone 5S with no problems.

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