Science Technology How to Make a Water Battery By Megan Treacy Writer University of South Carolina Megan Treacy is a freelance writer from Austin, TX. A former editor at EcoGeek, she worked as a technology columnist for Treehugger from 2012 to 2018. our editorial process Megan Treacy Updated June 18, 2013 Share Twitter Pinterest Email Science Space Natural Science Technology Agriculture Energy This fun project comes from Instructables user Roy02. With a few materials and a little bit of time, he shows us how to put together a working battery made from water. 1 of 5 Materials credit: Roy02 This project, which is part of the Instructables Green Design Contest, could be used to add a little charge to your smartphone or be a fun way to introduce battery chemistry to kids. Roy02 says, "The concept behind it is to make a galvanic cell that works on either a saltbridge or a sourbridge. In this case it's a saltbridge, but you could try using plants or wine (sourbridge) to create the same effect." Things you'll need: - copper sulphate - zinc sulphate - water - led lights low voltage (testing) - clamp cables - 6 plastic bottles (1L) - 6 pieces of copper - 6 pieces of zinc 2 of 5 Get started credit: Roy02 The first step is filling the bottles with water. I recommend using six (6) 1L bottles. Put the bottles in a wooden frame so you can move them around more easily. Cut the copper and zinc into 6 pieces each that you can clamp and put into the bottle neck. 3 of 5 Make the battery credit: Roy02 Fill the bottles and connect the anodes en cathodes: left bottle above: add 20 gr of copper sulphate left bottle below: add 20 gr of zinc sulphate center bottle above: add 20 gr of zinc sulphate center bottle below: add 20 gr of copper sulphate right bottle above: add 20 gr of copper sulphate right bottle below: add 20 gr of zinc sulphate Each bottle will produce around 2 volts. When you have this prepared, connect the copper to the red wire, with zinc on the other side so you will have a + and - side. Put zinc to the dark wire and on the other end copper. Start in the first bottle with copper and the end in the next bottle (zinc) in the second bottle you start again with a red wire that will end in the next bottle and there you start again with a black wire. This will create the electric circuit. (Make sure the clamp cables do not touch the water.) 4 of 5 Close bottles and test voltage credit: Roy02 When you're finished filling the bottles and connecting the cables, you'll end up with a red + and a black - wire from the first and last bottle. Make sure you cover the bottle necks with plastic or rubber so that you minimize evaporation. Measure the voltage using a voltmeter. You can also test it by using a LED that is close to the average volt that is produced. The picture shows a 12 volt LED burning. 5 of 5 Finished credit: Roy02 By using the clamps, you could connect the battery to a charging wire. This makes it possible to charge a low-powered gadget or possibly even a cellphone like in the 3D concept.