loads really fast

Corresponds exactly to the capacity of Mbuynow Power Banks with 13200 mAh (eg Asin B00IYHTGJC) that grants you the chance already for 10 (from China) to 17 Euro (Germany) gets, but often falsely labeled as 20,000 or even 50,000 mAh.
Mbuynow 13200mAh Power Bank 2 USB Output External Battery Pack mobile charger + 5 Adapter for iPhone, iPad, smartphones, iPod red

The capacity I ermittel by I run USB lamps because a comparison of the term gives a good idea how the information is correct.

The mbuynow battery costs typically (at Amazon) about 25 euros, then what justifies the extra cost at Easyacc?

1) service and brand - with Easyacc one can assume that good materials are installed, is in China, depending on battery supplier before the danger to get used again built batteries. The then keep not too long

2.) also still brand: Support in case of defect. I think Easyacc will be there like XTPower who replaced me a device without any problems, as the electronics blew

3.) Charging time: about vollzuladen (at 25 Watt AC adapter anchor with quick charging cables, 5 piece pack of Easyacc, ASIN: B00JL1490G):
EasyAcc Micro USB 2.0 Quick charging cable (5 pcs.), USB 2.0 Type A Male to Micro B cable, USB to Micro USB Cable [Only for charging - no data transfer possibility]

Mbuynow: 17 hours

Easyacc: only 9 hours

The charging time speaks for itself, and is for me decisive in future only this Power Banks to buy, even if they are three times more expensive compared to the China Import.
1 star deduction Weil's of course already has a steep price because of the somewhat glamorized and capacity indication.

Note: when charging according to meter flow 1.4 amperes. Normal USB data cable limit the current to 1 ampere. Therefore, be sure to use the included charging cable, or any other fast-charging cable, otherwise the Gewschwindigkeitsvorteil lost again.