purchased two for a total of $35. disassembled one to see what power bank circuit board it used, and to capacity test cells. unfortunately as almost every single power bank that's listed from a third party seller on the Walmart app these are extremely over exaggerated in their capacity. I tested both the cells that were paralleled together separately two times each and neither could reach 10,000 milliamp hour at 500 milliamp discharge rate. so you will get much less than 19000mAh after it steps it up to 5 volts and you draw more than a half an amp. do not recommend to purchase these unless you plan to harvest the cells and you spend less than $15 each.
the power bank circuit board that they use is also a poor quality 22.5w varient you can get on AliExpress for around $2 to $3. I wouldn't recommend using it on an expensive phone.
I break mine so you don't have to.
I'll return the unopened one and repurpose the 9,000 milliamp hour cells.