Can an iPhone take 2.1 amps of charging?

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

  1. slapple macrumors 6502

    Jul 25, 2008
    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

    Sep 27, 2010
    Nor Cal, USA
    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

    Feb 9, 2011
    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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