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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.
@BillM
The charge level reflects the voltage measured by the Bangle. This voltage will vary according to the current drawn by the Bangle.
The voltage of the battery, measured by the Bangle, will vary according to load on the battery. Batteries have internal resistance so the voltage seen by the Bangle will decrease as the current drawn increases, according to Ohm's Law. So, the voltage will go up and down as you turn on and off various things such as GPS.