Notebook without battery powered by a powerbank?

Thanks for the answer.
So I don't need a battery?
Yes, I know the battery will be cheaper. But I rarely need a laptop powered by a battery. I could use the powerbank for other devices.

Will this one also be good?

https://us.baseus.com/p/baseus-amblight-digital-display-quick-charge-power-bank-30000mah-65w-26

You would need this:

https://www.dell.com/en-us/shop/accessories/apd/451-BBKV?gacd=9646510-1028-5761040-266706306-0&dgc=st&ds_rl=1282789&gclid=Cj0KCQjwr4eYBhDrARIsANPywCi50jgpDyMi4VlXtr0UHz3HGa_gosZkpXDAiB-hxjW7EipIsDjY5JoaAuuTEALw_wcB&gclsrc=aw.ds&nclid=tgrbjAfDhBCIAfIl7kQhxme3oCqcF995EIMc6qBeVBhYnLWyiZUJcSezjrKmnTcU

Given the cost, a battery may be less expensive.

You'll have to ask the manufacturer of the device.  Be sure your system has the optional USB 3.1 type C port -- the other USB ports do not support charging.

I already know everything. Thank you very much

How long can my notebook run with a Dell Powerbank?
No games playing, just web browsing and email.

Since the system had a 42 WHr battery initially, and the power bank is 65 WHr , 65/42 = 1.5 so about 50% longer than whatever you saw when the system was new.