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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.
@user140377
http://www.espruino.com/Bangle.js2#power-consumption says that power consumption of HRM is +0.7mA. Health does turn in on for 3 minutes, it is probably even less since the LED is not constantly on. I would say its not a big deal.