Question about Anker Laptop Power Bank

You can fully charge your Apple MacBook 16 inch, 2019, about once with the Anker Laptop Power Bank (25000 mAh, 165 W, 90 Wh) when the power bank is full and not being recharged.

Justification: The power bank has a capacity of 90 Wh, while the MacBook Pro 16-inch (2019) has a battery with approximately 100 Wh. Due to energy losses during charging (efficiency usually around 85-90%), you can achieve about a full charge of the MacBook battery with 90 Wh of the power bank, but not more than that. The power bank delivers enough power (165 W) for the MacBook, which has a 96 watt charging requirement.