Can an iPhone take 2.1 amps of charging?

Discussion in 'iPhone' started by slapple, Jan 19, 2012.

  1. slapple macrumors 6502

    Joined:
    Jul 25, 2008
    #1
    I just got a Kensington dual car charger. It has a 2.1 amp USB slot, and a 1.0 amp USB slot.

    I did a little bit of testing this morning on the way to work. I plugged my iPhone 4S into the 1.0 amp slot, and after 4 minutes the iPhone gained 3% of charge. Then I plugged the iPhone into the 2.1 amp slot, and after 4 minutes the iPhone only gained 3% of charge.

    I was hoping the iPhone would charge twice as fast in the 2.1 amp slot, but that didn't happen. Does the iPhone only take 1 amp, even in a 2.1 amp slot, or what?
     
  2. sbddude macrumors 6502a

    Joined:
    Sep 27, 2010
    Location:
    Nor Cal, USA
    #2
    it can charge from wither port but probably won't charge any faster. That 2.1 amp slot is probably designed for an ipad.
     
  3. takeshi74 macrumors 601

    Joined:
    Feb 9, 2011
    #3
    Please read the countless other charging threads. All devices draw what they need and that's it. IIRC the iPhone won't draw 2A.
     

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