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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
If you get JST connectors (digitalmeans do them very cheaply) then you may be able to use some batteries you have kicking around...
Old phone batteries work great, and you can also salvage cells from old laptop batteries (although you want to be careful as those ones don't have protection circuitry in each cell).