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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.
@fanoush
In theory it can also be the cable or the thing you plug the cable into (power bank, computer, charger). Can you try other power source (or other cable if you have multiple watches)? can you measure voltage between two outer spring-loaded pins on the charging cable that connect to bangle? It should give 5V.