Can I hook 5v lipo batteries together to run an electric scooter?
a) The battery spec from the scooter page is: "Nylon handled pack, 24V/10AH pack,(2) 12V/10AH valve regulated, rechargeable". The scooter is 500W, which requires 20A at 24V.

(You originally mentioned a drone, at 20V, and then changed the example!)

b) Ebay specs and Chinese battery specs are often unreliable to fraudulent. I have a pack of the same size that's 10AH not 50AH. Their quoted max output is 2A, let's choose to believe that for the moment.

You need 20A, the packs might put out 2A. So you need (at least) 10 in parallel. You also should be close to the 24V nominal voltage of the official battery. So you need to stack 5 in series.

This results in a "10P5S" pack of 50 powerbanks as the minimum requirement.

(Each of those packs is a Lipo prismatic/"pouch" cell with a nominal voltage of 3.8V and a small circuit board to do the charge/discharge voltage conversion.)