So if I already have a modified cable, I should get 1A and 2.1A out, respectively or do I need to modify the charger too?
You should not need to modify the charger as modifying the cable connects the two leads and this is what is needed.
However, I think you would be wasting your time as only certain devices (like the Nook) won't accept higher then a 1amp charge. As such, their cables are already modified.
Most phones (pretty much all) won't even accept a 2.1amp charge. From what I can see, any thing in the 700mAmp range is going to be enough. Granted, I suspect using a ton of resources at the same time might allow a higher amp charging but I suspect not much more (otherwise a 500mAmp charge would take all day to charge a phone).
There is certainlly nothing wrong with using a 2.1amp charger. However, chances are good that without the correct cable and hardware to accept that charge that it's going to be a lot less. But I'd also not recommend anything less then a 1amp car charger.
i ended up buying this one a couple weeks ago http://www.amazon.com/Arcadia-hig...sim_cps_13
from the same company since I dont have a tablet and do not need more than 1 a per port. I use it for my nexus 4 and it shows up as AC charging ( not USB since that is only 500ma)
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