# How much an output amperage should be to achieve a fast charging?

#### zillah

Mar 4, 2012
21
Dear folk

To my understanding, (please correct my confusion)

Output voltage most of the time is 5 DCV

To achieve fast charging fast charging amperage should be bigger or equal to 2 DCA

I did a test using 2 USB power meters and 2 different genuine lightening cables and 2 genuine wall adapters (10W, means 2A as voltage always 5) to test it on iPhoneX which can take up to 2A

As per the attached snapshots output current was less than 1 ?? Means not fast charging ?

https://imgur.com/a/kisBgoW

Thx

#### Alec_t

Jul 7, 2015
3,590
Welcome to EP!
For safe charging the phone will decide for itself how much current to draw, dependent on the existing state of charge of its battery. At some point in the charge process it may draw 2A, but you can't force it to take 2A continuously.

#### zillah

Mar 4, 2012
21
For safe charging the phone will decide for itself how much current to draw, dependent on the existing state of charge of its battery. At some point in the charge process it may draw 2A, but you can't force it to take 2A continuously.
Noted

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