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I bought a 65W powerbank that worked well with my laptop that uses a 65W charger.
However, when the powerbank reaches 50%, it starts producing less than 65W.
That's why I was thinking of using a powerbank with more than 65W (for instance, 100W).
Is it a safe bet?
Mostly yes
When charging a laptop, the powerbank will push a specific voltage, and the laptop will pull a specific amount of current. In the case of USB-C, they will then contact each other to get the optimal amount of voltage and current, and will run that. If you charge your laptop over USB-C, this will be safe, if not, check first if the voltages are within like 0.05V of each other.
