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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
That is surprisingly low battery life - have you installed a clock face other than Anton? It's entirely possible that some clock faces really drain the battery hard.
But the bluetooth connection could hurt battery life - usually it goes to a low power mode after 1 minute of inactivity but if stuff is being transferred it'll stay in the high power mode which draws 1mA, which would fit well with you 8 days battery life.
It is possible to force it to use the low power connection mode all the time, so I guess that could improve things for you. If you install the 'Custom Boot Code' app and paste in:
That'll use the low power mode - BUT subsequent app uploads will be WAY slower until you delete the app again.