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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
Thanks for letting us know! I'll add a note to the docs.
By the time the magnetometer fails the battery is almost completely dead - it just happens that the microcontroller is a little better at eeking out the final few percent than the magnetometer is!