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I would not buy batteries from AliExpress. I'd recommend getting an 18650 cell from Illumn.com or Imrbatteries.com, then an 18650 sled to attach to the charging circuit.
You can also go way lower for your charging circuit, since your solar panel will never get close to 10A.
Amazon sells a solar charging circuit with an 18650 sled on it.
So just something like this or could I go down to 2500Mah?
https://illumn.com/18650-samsung-inr18650-35e-3500mah-high-discharge-flat-top.html
Also, I was seeing 18650 battery chargers on Amazon but I'm not sure what you were referring to for the "solar charging circuit"?
That one should last up to 16h, and the 2.5A up to 12h. there are also shorter batteries in the 18xxx series if space is a factor.
You can connect that 5v panel directly to the charge input on the power bank - they are both 5v. There is a charge controller built into the bank already.
If the bank has pass-through charging that can accept a charge at one end while delivering power out the other, you are all set.
But some power banks don't allow that.