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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.
@AkosLukacs
Have you connected anything to serial pin (D0 on MDBT40Q)? That would turn on the high speed oscillator and increase power draw.
Also, are you connected via BLE (or any phone or computer that may connect automatically)? You have to disconnect to actually shut off radio.