Need a battery bank for my Razer Phone

[gore.daniel9]

So I want to buy a battery bank for my phone, I'm currently looking at one from Anker for about £23, it's 10000mah but the output is 5v at only 2 amps. With my older phone I would have ocer looked this but on my wall adapter there is 3 different output voltages each with a different amp rating. I assume this is to do with my phones Qualcomm Quick charge 4+ or something, but that bit is confusing me about my purchase. Just want some advice on if the one I have chosen is ok or on a different suggestion (Preferably UK shipping only)

https://www.anker.com/uk/products/variant/powercore-10000/A1263011 - Is the one I currently am viewing

 

[Gam3r01]

I have that battery, its great all around except for one feature, it does not support rapid charging.
If you want to have rapid charging, get the powercore II 10k:
https://www.amazon.co.uk/Anker-PowerCore-Ultra-Compact-10000mAh-Portable-Black/dp/B072MH1434/ref=sr_1_2?s=telephone&ie=UTF8&qid=1538335486&sr=1-2&keywords=anker+powercore