Turning the DSO on whilst having the USB plugged in will cause it to glitch and will be stuck in USB charging mode permanently and won’t draw power from the battery.
You must Unplugging the battery and then back in to get it to run off the battery again.
Just happened again but whilst ground was connected to an external circuit.
Is this a firmware problem or a electrical problem of the DSO nano V2?
Edit:
Due to continuing poor experience from seeed and it’s products, I will no longer be recommending this device to anyone and will submit my review to your distributors accordingly.