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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.
@Oscar
As far as I remember, the 5V pin is directly connected to the 5V pin of the USB header. That is: you will get 5 V from the charger only you have it connected via USB to a power source.
In order to integrate the charger into your project, you would power the MDBT42Q using the BAT and GND pins of the charger, connect the LiPo battery to the charger and using the USB port of the charger to charge the battery when needed.