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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.
@Ganblejs
I just looked at my battery chart and I can see something similar, rapidly going from 60 to 40 % charged, around 5th of May. I don't remember if I did something particularly intensive at that time though.
It's hard to say what is normal drain since it varies heavily with usage/installed apps/how many notifications you receive/how much you play around with it/etc. For my usage 4 to 5 days would maybe feel a little on the short side but not unheard of.
The list of installed apps from the "More..." tab of the app loader and some more details on what settings you use and your use pattern may help us to judge with a little better certainty.
EDIT: Also there are some tips re battery life in the FAQ.
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