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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.
@Gordon
If the screen is unlocking but backlight isn't lighting it'll be because you're still on the original KickStarter firmware and need to update it.
In terms of battery usage, have you changed any apps? Specifically the clock face can really suck up power if it updates every second. What I'm seeing here with the default apps is significantly higher than a 4-5 day battery life.
I would expect the battery percentage to be a bit non-linear towards the end though - it's a hard problem as all we have to go by is battery voltage, and that changes not just with the calibration of the resistors in the watch, but by temperature too.