You are transported back to the year 1600. What could you realistically build all by yourself that hadn't been invented yet?

@Dainbramadge Could you build a battery based on materials known at the time?

@helenS Yes. Slat water, zinc and copper plates separated by paper.
I saw some guys that made their boat run off the salt water in the ocean. LOL
I actually think it was Faraday that made that first battery. Not positive tho.

@Dainbramadge A "Voltaic pile", invented by Alessandro Volta around 1800. Congratulations! 💋