[vanderZwan]

Already addressed in the video - another YouTuber put ten oversized versions in a series and barely got a single LED to light up.

[unnouinceput]

So put a hundred more in series and you get bigger voltage. If 10 of them lit a LED, which needs something like 1.5V then 100 of them would give you 15V. Car batteries are 12V or 24V, depending on the car model/size, so 100 or 200 in series and you get that covered.