how do u make something work if batterys dont exist what else could you use ?

Question: how do u make something work if batterys dont exist what else could you use ?
- Keywords:
  batteries
Asked by 625radh36 to Amanda, Olivia, Alex, Marco, Sha on 14 Mar 2017. This question was also asked by gta5, 947radh36, moonlight.
- Alex Evans answered on 14 Mar 2017:
  
  Electricity can be generated by lots of things, so instead of using a battery, you can make your own by setting up a chemical reaction that generates electricity! You could also try and use electric eels if you were feeling risky!

Question: how do u make something work if batterys dont exist what else could you use ?