DIY Eco-Friendly Calculator Battery




About: Thank you instructables!!

This project is very environmentally beneficial, as it takes a dead battery and turns them into a new one, preventing the creation of electronic waste. The possibilities are endless on this concept (stronger batteries, tiny batteries) and just think of what it would be like if everyone on this planet was able to recycle old batteries.Just we need the electronic waste to be turned into a new battery .Needed for just about every electronic project, electronics revolve around them. But think about it, What happens once they lose their power? You throw them away, just like all 7 billion of us on earth.And this project is all about calculator battery . As our calculator battery gets dead we need to purchase a new one .But that costs some money and also creates waste so here's a fresh instructable which would tell how to make DIY calculator battery.

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Step 1: Things Required

For this project we need :-

  1. Old discarded AA sized battery
  2. Aluminium foil
  3. Long - tiny container
  4. Wires
  5. acid (vinegar) ,salt solution or simply tap water
  6. This we need to make this

These all can be got from scrap except precious water .

Step 2: Dissecting the Cell

Most of the dry cells they consist of a Carbon Rod (what we need) surrounded by moist electrolyte paste.

Cathode (Positive ): Carbon Use the pliers to take out carbon rod from the cell.Once its off, you will see the top of the carbon rod, slowly pull until the carbon rod is out.

Step 3: Cleaning Cathode

After taking it out you should clean it with some sort of cotton clothes to prevent including of some other unwanted chemicals.

Step 4: Container Holes

Take a screwdriver or scissors to make a hole in container cap and then pierce carbon rod through it .Drill a whole the size of the carbon rod so it fits snug. Place the carbon rod into one of the hole leaving about 1/2 an ince sticking out from the top

Step 5: Making Anode

Now you need a piece of aluminium foil that should surround the container from inside but in such that position that the carbon rod should not make contact with it .To do this firstly cut a square piece of foil and then make a rectangular strip of it and then make it roll around the body to cast it in its dimensions and move on to next step.

Step 6: Connecting Wires

The carbon rod is now +

The foil is now - just take two wires and connect them to the two electrodes . Use glue to make it water proof .

Step 7: Filling Electrolyte

Fill the tiny container with a salt water mixture and place the lid back onto the container. You are now done.Mix it fully to make a solution . If desired make it saturated.

Step 8: Final Finishing

Now You Must screw down the cap of container and close it tightly and the two must must be connected to the terminals of the calculator Red wire (usually +ve) to carbon rod and black wire (usually -ve) to aluminium foil and then move on next step.

Step 9: Done!

First of all test the battery on opened calculator if it is working then close the calculator and Do calculations . The first picture is of open calculator and second one of closed . I've edited second picture using the method told in Pure White Background Photography Using Smartphone instructable.Just think of the limitless possibilities you can create with your own batteries. Not only do they work, they also reuse old dead batteries, preventing the creation of electronic waste.

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    11 Discussions


    1 year ago

    Another simple and quite ingenious instructable. I'm being completely serious. If people did this all around the world it would eliminate so much waste and you are right, every little gadget on here that uses batteries could be improved by having a self-sustaining cell like this to power it. I have seen something similar before but this is the best design I have come across. I love it and will be sharing it for sure. Also, I live in Florida and we were out of power with no generator for almost 2 weeks. We eventually got a generator once The American Red Cross shipped in a bunch. This idea right here would have powered my little FM radio I slept with and kept a light on for safety. Just, amazing. Thank you for sharing this. :-)

    Hey. Great instructable. Would it work if I were to use a NaOH (sodium hydroxide) electrolyte of pH-12?? Thanks in advance.


    hey, thx for the modern design of the Baghdad Battery. Check these sites out. Think 2 rods might be better and a bigger design like the sites.

    2 replies

    Didn't look like the youtube sites made it thru, but it's at YouTube. Also have you read nikola tesla treasury, by nikola tesla. It's $1 or so on amazon kindle app. Great stuff in wireless eletrical. If you make any heads or tails from it in an applied way, let me know.


    4 years ago

    Practical if you only need to power up a calculator! I doubt you could get any appreciable current out of this to power anything useful. If you are interested in getting every last drop of power out of a battery look into the joule thief.

    1 reply

    4 years ago

    Great 'ible for teaching my kids about renewable energy.
    Approximately how long will this battery last...

    1 reply