The large base with the yellow/black tape on it is where they are hiding the battery, dumbasses.
Very small batteries then https://youtu.be/-ftPmhYAEr8?t=979
Power cords or wireless transformers don't need much space.
For a battery oriented strategy, I would go for the motor, maybe there's a way to free up some space in there for batteries, since it's the only element that doesn't get modified/opened
The video editing is cut. I guarantee you that "plywood board" is hollowed out and filled with LI batteries. The board the alternator and electric motor are bolted to is unnecessary, except to conceal the batteries. It looks like it's over an inch thick, which can store a lot of batteries. Why not bolt them to a transparent plexiglass sheet if there are no batteries in there?
If it were actually possible to make a perpetual energy machine from a truck alternator and an electric motor, the market would be flooded with them and utility companies would be out of business in a few months.
The batteries are definitely not in the base https://youtu.be/7jldc-k3Blg?t=1248
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