...most appliances are the same. If you plug a cellphone charger adapter into a cigarette lighter port on a car, the phone doesn't fry. Same thing here, the amps are there, but won't be all rushing in to blow up the circuit.Or, see it another way, you can plug a little clock radio or a vacuum cleaner into a wall socket.
The car battery would allow many such circuits to run, if you wished, whereas say a bunch of AA's made into a 12V pack would only last a few minutes.
I believe the pack Lasersaber probably used was a 4S Li-Po, normally used for R/C aircraft or cars. Such packs deliver 14.8V (3.7V per cell), with 20C=30C discharge ability (plenty of amperage) and he did mention 14V in the video. He's shown his quadcopter and the Paramotor before now, both using R/C components. It'd be something like a 500mAh pack.
In light of that pack, a car battery would be ideal, though much larger.

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