✨This simple Salt Water Battery is Rechargeable: Copper Wire + Aluminium Foil + Salt
The battery has 4 cells connected in series and generates a voltage of 2 v when fully discharged, and after charging the battery voltage rises up to 5.2 v and it is able to provide a current of 830 ma despite it's small size.

Copper Ion battery or Cuion battery is the name i'm assigning to this cell type because copper is the active element that stores the charges and releases them during charge and discharge.

It is made all from recycled items from trash can, like chocolate bar foil for Negative electrode, or pieces of scrap wire for Positive electrode and the electrolyte is Salt Water.

I might be able to use this rechargeable salt water battery as my robots power source!