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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.
@AkosLukacs
Is your battery still alive? Check with a multimeter whether it still outputs 3-4V.
Is the polarity correct? The charger and the battery may have different pinout...
It's possible, that your battery is dead. Btw, most likely you can get the battery locally (altho don't know where you live), or from a proper electronics parts supplier (digikey, farnell, mouser. Or one of the hobby electronics stores).