I use nexus 9 cable with Samsung 2.1 ampere charger.
Also I turned the current to 2100ma using arter kernel..
It charges 0 to 100 in just 50minutes now [emoji13]
(2100Mah battery)
Theoretically a 2100Mah battery is supposed to charge fully in 1 hour when charges with 2100mA current , but here...
I had a 23000mah power bank s3 didn't charge with stock USB cable , tried charging with nexus 9 cable ...
It worked!
Heck it even supports 2100ma current which charges the whole battery in just 50minutes!