Welcome to Hackaday's Coin Cell Challenge. This challenge is all about building something that is powered by single coin cell battery.

Ignite your creativity. Try out low power, whether it is new to you or anyone else. We want to see some amazing power sipping attempts and for you to document it all. Share what worked and what didn't. Extra wrencher points if you share photos of destroyed batteries pushed too far during experimentation.

In short, do something awesome with a coin cell. But we also have special prizes for the examples in three different achievements: Lifetime Award, Supernova Award, and Heavy Lifting Award.



The Winners Have Been Announced!

Congratulations to all of the winners, and honorable mentions!

Awards and Prizes

The top 20 projects will be rewarded with $100 Tindie Credit plus three additional cash prizes of $500 each for the following special achievements:

Lifetime Award : Running the longest on a coin cell.

: Running the longest on a coin cell. Supernova Award : An exciting display of power -- battery lifetime be damned.

: An exciting display of power -- battery lifetime be damned. Heavy Lifting Award: Disbelief. Think: "you can't do that with a coin cell battery."

How to Enter

Build something powered by a single coin cell and document it as a new project on Hackaday.io. Once you have published your project, look in the right sidebar for the "Submit project to..." menu in order to enter it in the Coin Cell Challenge:

Judging Criteria

How novel or interesting is the entry?

How well is the project documented? Is the description, details, instructions, components, and build instructions filled out?

Is the project open source? Could the work be replicated based on the documentation?

How complete is the entry? Projects don’t have to be complete or working to enter, however those which are finished and working by the deadline may be judged higher.

Coin Cell Challenge Contest Rules: