I've bought many third party lightning cables in the past from online shops, and those cables have not been able to achieve a true 1A charging rate. This cable is the only exception so far that I've tested. This is the Belkin MIXIT^ Charge/Sync cable.
Disclaimer: I have no idea whether this cable that I've purchased online is the real deal from Belkin. Since it charges at 1A, I would assume that it is Belkin legitimate cable. I also need to mention that the original iPhone lightning cable from Apple charges my iPhone with around 0.02A increase in current compared to this cable. This is nothing to be surprised about as I would have known that Apple's original lightning cable would be the best for its products. Still, charging at 1A is still pretty darn close.
Currently, I own 2 of this cable (One in black and another in gold). I bring one of them to camp just in case the original lightning cable spoils. I haven't tested the cable on iPad to see if it truly achieves 2A, though
On a side note, iOS devices draw more current when the screen is on. The amount of current that the device draw is related to the battery percentage of the device at the time of charging. The current drops as the battery of the device slowly progresses to a full charge. Therefore, to test the cable, I ran my iPhone 5 down to less than 5% battery with the screen off.
As always, take care and I'll see you soon :)
Updated: 12 March 2021
Dazhong Primary School
Bukit View Secondary School
(Diploma in Computer Engineering)
University of Wollongong
(Bachelor of Computer Science - Digital System Security with Distinction)