Model: PB2050ZM, Product size (Lx Wx H): 15.35x 7.35x 2.75 cm / 6.04x 2.89x 1.08 inches, Output: 50W MAX, Package weight: 0.8000 kg, about 4.5 hours (45W charger), Product weight: 0.5000 kg, Power (W): 50W MAX, Three ports: 5V-5.4A / 9V-3A / 10V-5A / 12V-3A / 15V-3A / 20V-2A, Dimensions and Weight, USB-A (single port): 5V-3A / 9V-3A / 12V-2.25A / 20V-1.35A, Charging time: about 11 hours (5V/2A charger), Input: 5V-3A / 9V-3A / 12V-3A / 15V-3A / 20V-2.25A, Type: Portable Mobile Powers, USB-A (dual port): 5V-3A, USB-C: 5V-3A / 9V-3A / 10V-5A / 12V-3A / 15V-3A / 20V-2A, Working temperature: 5 – 35 Deg.C, about 6.5 hours (18W charger), Battery energy: 74Wh / 3.7V / 20000mAh, Material: ABS, Rated capacity: 12000mAh (5V / 5.4A), Package size (Lx Wx H): 16.00x 10.00x 4.00 cm / 6.3x 3.94x.
Basically copy coupon, view price history or create e-mail price alert. You probably want to know what is the best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Europe 
. Too bad there’s no coupon right now in Banggood. I don’t really know if this price is reasonable, coz there’s no price history in my DB.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): aff7off, Email5, BG50wpb5, 2020CNY, BGVDay10%off, bGhOnEy10, BGXMI15, BGdragonBoat, BGAFF10OFF, BGSS10%SW, bgshOOp10, BgoFErTaSchInA10, BgcLuBofErtA10, BGXiaomi50WBank, BG15POWERBANK, 7d18f7, BG8107IT, BG3Xiaomi50W, BGCuponation10, 13f142, BGHONEY2110, 7bcdf9, BANGGOODSD, BGCCARG, BG85d5c6, BGAlerabat, 2022ACTIESNL, Tabby20, BG1efeb0
(I don’t think these’re gonna work, but you can try ’em out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – Xiaomi Power Bank 3 20000mAh 50W Super Flash Edition ($-3)
Price history and price alert
It’s a new item in our database, so I can’t create price history chart. We have saved this price in database: $42.99.
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).