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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
Hi!
There aren't immediate plans right now for a rechargeable Puck, although probably the next one I make will have an nRF52840 which has USB, and if it has a USB socket then rechargeable does make sense.
However, something like Bangle.js actually has a bunch of similar features (accelerometer, magnetometer) in a similar size, plus also display, GPS, waterproofing and rechargeable battery.
I'm also in the process of sourcing a boxed, AA-powered device with accelerometer, which might work for you too? For most things that should put the battery life squarely into the 5+ year region.
Which features did you need for your projects?