If you're willing you could open the back and it'll be really obvious if there isn't a gold disk on the back of the battery.
If that's the case we can either swap it or I can send you a piezo to solder on
@Gordon started
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.
If you're willing you could open the back and it'll be really obvious if there isn't a gold disk on the back of the battery.
If that's the case we can either swap it or I can send you a piezo to solder on