My engineering task is “Handcraft Electric generator.”

I was thinking about a “Solar panel car” and a “rubber string car,” But I chose to do this task because the ones mentioned before have no practical use other than play; however, a “Handcraft Electric generator” can actually be used.

I like the overall idea, but I have a better idea of using substances(https://www.google.com/search?q=handcraft+electric+generator&source=lnms&tbm=isch&sa=X&ved=2ahUKEwiVoIXIusz9AhVNkVYBHT4wC0wQ_AUoAXoECAEQAw&biw=1440&bih=821&dpr=2#imgrc=LP8pcyKeyc_v3M )

The audience will be all people older than 3 years who need a battery.

The Handcraft generator makes energy from human power. If you roll the handcraft attached to the product, the wire spin and make the motor spin. And the motor generates the energy and seed to the battery by wire.to This product target people who need a new battery with other stuff. Therefore, they need a battery and other products to consume energy to use this product.