How fast can a 5v 200mA Supply charge a 5v 1A batter?

unspeakable

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Oct 13, 2017
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I need to know how fast a 5v 200mA (not battery life, amount of power) can charge a device, such as a portable battery, that needs an input of 5v 1A.
How fast can a 5v 200mA Supply charge a 5V 1A device
 

unspeakable

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Thank you. I didn't realize that it worked the same way as basic math. Lots of thanks.
 

unspeakable

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Oct 13, 2017
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MERGED QUESTION
Question from unspeakable : "Can 5v 200ma charge 3ds/2ds"

Can 5v 200mA power source charge a 2DS. The Nintendo charges at 5v 1A. My power source would charge at 1/5th the speed but would it work.
 

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