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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Are you sure you didn't upload any code? What did you do with them after turning them on?
If you tried examples on the http://www.espruino.com/Puck.js+Web+Bluetooth page, the last example there comes with a warning that after trying it, unless you reset your Puck it'll run the battery down pretty fast.