voltage readings

Hi guys, my CrystalSky 5.5 won't switch on, the battery has four lights lit but when I meter between the pins there's no voltage present. Does the battery sense being attached before it delivers power? Could someone meter their battery and let me know what you find. Hopefully it's just a...

I notice on the DJI GO App, under Battery Status, it gives read outs of each individual cell and also allows you to display the voltage on the Main Screen. My problem is I can't seem to find a definitive answer on what the voltage readings mean. Some say to start landing if the voltage hit 3.6...