Can an iPhone take 2.1 amps of charging?

[slapple]

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?

 

[sbddude]

it can charge from wither port but probably won't charge any faster. That 2.1 amp slot is probably designed for an ipad.

 

[takeshi74]

Please read the countless other charging threads. All devices draw what they need and that's it. IIRC the iPhone won't draw 2A.