Laptop power bank

[whatever61]

I am trying to understand how many times I can charge my laptop with a powerbank with the following specs:

My laptop battery specs:

6280 mAh or 47 Whr
Voltage 7,935 millivolts
My charger is 19V 2.37A

The specs of the powerbank:

50000 mAh
3A

Should I just divide 50000 on 6280 and get my number and multiply it on the resistance factor of 80%?
Sounds too good to be true..

Thanks

 

[whatever61]

Bump!