Is there a power bank that would work properly on MacBook Pro (15-inch, 2019)?
Solution 1:
The MacBook will charge from anything that connects to a USB-C cable.
The Apple Charger for the 15" MacBook Pro charges with 87 Watts. Anything lower will also work, but will charge slower. I'd look for something with a 60 Watt or at very least 45 Watt output. I think anything below that would be painfully slow.