it's not anker power IQ it's just any devices "power IQ" it draw as much as it designed. If device was designed to charge max at 1.5A it will take from anker power iQ or any power bank with 2.1A output 1.5A it's just lame how many millions people have bought this BS.... BTW in their home page they compare it to USB laptop port lol, you better compare it to other power banks 2.1A output and I'm 100% sure that results will be same then and then you don't have a "trick" to market...
Why they don't compare it with other competitor power banks which provide 2.1A output
it's been discussed gazillion times in forums and everywhere that device decide how much power it will take and NOT the charger. Of course if charger can give max 1A and device want up to say 2A then yes it will charge with only 1A but any charger with 2.1A output will charge "intelligently" any smartphone....
here is article I read and quote:
"Can I blow up my USB device?
iPad USB chargerThere is a huge variance, then, between normal USB ports rated at 500mA and dedicated charging ports which range all the way up to 3,000mA. This leads to a rather important question: If you take a smartphone which came with a 900mA wall charger, and plug it into a 2,100mA iPad charger, as an example, will it blow up?
In short, no: You can plug any USB device into any USB cable and into any USB port, and nothing will blow up — and in fact, using a more powerful charger should speed up battery charging."