lefty I'm not trying to get you mad or any thing but your missing a part here
Take a Iphone charger there made to do to things one is supply 5 volts .
Now if the battery is dead you want a fast charge these supply's can dump a amp on the battery and still keep the voltage at 5 volts and charge current at there rating but at no load they just keep the voltage at 5 volts they use CCCV