When do you decide to get another battery?

[The Camry]

Been watching way too many spl videos on youtube and im seeing guys in 4 door sedans on a 320 amp alternators with 4-10k watts on their subs. To my knowledge, 14 x 320=4480 watts. That should be the max they should be able to sustain their electrical safely.

I guess i just dont understand how batteries work to hold extra wattage needs. Anyone care to inform me on how this works exactly?

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