Assuming a fully depleted car battery of, roughly, say, 800 Wh, and not even such a small powerbank of, say, 60 Wh, it becomes clear that such a powerbank does not have a sufficient amount of energy to charge the car battery to the level at which it can output the current required to start the engine sustained during a few seconds.
Maybe not for winter but certainly seems to work in summer temps.
Wifey forgot lights on in her car and called me to resque. I was lazy to carry lead-acid battery around so I took two 18v makita batteries and 18A Riden dc-dc power supply in my pockets.
Took only about 30Wh (half of one battery) of charging to start the car. Fuel injected gasoline engine in summer temps wont need that much current nor time to start.
Same battery has to be able to start the car also in -30c winter, with cold battery and oil so it is very much overkill in summer conditions.
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