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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.
@Tobbe
The Pico is powered off of the USB battery, and the ESP is powered by the Pico. But I think the battery should be powerfull enough. I can't remember the exact specs, but it's at least 1A. I've used it to successfully run my RasPi before.