I was going to write that the sun is free energy.
I think you misunderstood my point with the bycicle. I implied, that it would be easiest to just use a bycicle instead of an e-scooter.

Then you come at me with 'free energy' and lithium-ion batteries and I thought it would be best not to increase the misunderstandings.

Sunlight is free, plants are the best bio-reactor we have to harvest sun energy and to store it, chemically. (In the form of carbo-hydrates)
That's it. That was my message.