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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.
@maze1980
According to the first post the battery dies after one hour. Then illuminating 10 LEDs for a minute will work for 60 times (that is again 60 minutes) until the battery dies. Is this enough?
What do you actually build, with 300 LEDs and portable (I guess, as it is battery powered)?