Battery Capacity 20000mAh, USB OUT1 5V/2.1A, Cell Type Lithium polymer battery, Rated Capacity 13000mAh (5V/1A), Brand Teclast, Color Black/White, Material PC+ABS, Type-C/Micro USB IN 5V/3A 9V/2.4A, Model C20 Pro (Quick Charging).
Price history, coupons and price alert are available on this page. What is the best price?
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in Europe 
. I’m not sure about the price, coz I have only 1 record(s) in my database. Well, there is one coupon available right now.
Link: Banggood product page
1. ($36.79): BG8ReviTrage
you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): BG721532, BG0fbaa4
(these coupons are old, so probably won’t work)
Price history and price alert
Not enough data to show price history chart… $20.99 is the only recorded price. It was not cheaper than that since we have saved it in DB.
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)).