Bicycle Mobile Power Box Battery Storage Case Rechargeable 21700

[Truevine77]

Where can I find a power pack for 21700 batteries? I already have a 6 pact for 18650 but now I'm looking for a similar version for 21700 similar to this one:

https://www.amazon.com/dp/B08CZ18YJB/?tag=cpf0b6-20.

I found this version for 26650 batteries but its prepackaged and I do not want cheap chinese imitation batteries.

https://www.lightmalls.com/high-cap...battery-set-for-led-bike-light-with-magic-bag