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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.
@HughB
71% after 1.5hrs with GPS sounds about right to me based on my experience.
You should get about 5->6 hours with GPS on before the battery will go flat.
I have noticed when there is a lot of stuff drawing power that the % pwr will recover a bit after you switch the power drains off. Hope that helps.