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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
Hi - I guess even if the motor draws 10-20mA normally, it's possible it takes a bit more that that for the first fraction of a second to get itself spinning?
I guess you're after something pretty small, but you can get pretty tiny LiPo batteries that would work great on the Breakout board's Vin pin (using the regulator). They'll also supply significant amounts of power so would easily handle your motor, and obviously they are rechargeable.