i got a bittle from a friend who could not get it to work and gave up on it.
after some troubleshooting i figured out that the battery was not supplying power to the NyBoard.
next i measured the voltage on the connector before and after pressing the button which turns the led on
both measurements gave 0V
after this i opened up the battery case and measured across the battery B+ and B- terminals.
this measurement gave me 7.8V
some observations on the PCB:
there was a layer of what i presume is flux on all the components
resistor R12 which i presume pulls down the switch Q2 was only 15 ohm
there was no connection between the ground of the battery and the connector going out even when the LED was on
the LED turns off after about 15 seconds
do you have any idea where the problem lies?
You need to long-press the button on the battery to supply power. Short click only shows the remaining charge. Please read the manual at docs.petoi.com.