I open this thread because I am tired of buying power banks that is too big, with slow charging or with bad capacity.
After to many trial and error I ended up with two power banks that is in my opinion the best of the batch.
Those were the minimum requirements to be considered:
1) very portable
2) very good capacity
3) fast charging (input/output)
4) premium materials
and here the two finalists:
Aukey PB-Y12 10050mAh and the Anker PowerCore+ 10050mAh
As you can see from the photos, both batteries feels very premium with aluminum case, both with 10050mAh capacity, both with protection against excessive current, overheating, and overcharging.
Aukey is slighly taller but fairly thinner,
Anker is slightly heavier with 241 grams over the 218 grams of the Aukey.
Aukey has three ports: 1x input micro USB, 1x input/output USB Type C, 1x output USB Type A
Anker has two ports: 1x input micro USB, 1x output USB Type A
Aukey can be charged from 0 to 100% in 4 hours using both micro USB or Type C.
Anker can be charged from 0 to 100% in 4 hours using micro USB only.
When charging phones using USB type A, both power banks are able to charge at approx 12W.
The real difference is when charging Type C phones, most Type C phones like Nexus 5X/6P, Google Pixel, Samsung Galaxy S8 and others are not able to be charged at full speed when using a Type A to Type C cable.
I have a Galaxy S8 and a Nexus 5X, both phones uses Type C port, Nexus 5X only report "charging" when connected to the Anker, "fast charging" when connected to the Aukey, same for the Samsung phone.
Aukey charges the phones a lot faster,
Aukey - Nexus 5X from 0 to 100% in 1 hours and 40 minutes.
Anker - Nexus 5X from 0 to 100% in 2 hours and half.
Aukey cost even a little bit less than the Anker.
So the finalist is the Aukey, it wins hands down.