DSO Nano v2 faulty after running out of battery

[HugeMan]

@bofh

But suddenly the screen has gone dark and my dso nano v2 stopped working with usb cable plugged in.
It boots (display is working fine) if I turn it on without usb cable but goes out after a few seconds (battery is not full although the usb cable was several days plugged in for charging it).
With usb cable plugged in it does not boot at all (the screen only flickers black / white).

Could a faulty battery cause such symptoms? How can I check the battery?
Or should it work with plugged usb cable no matter if the battery is ok?

Thanks in advance

1.DSO Nano can work with the usb cable pluged into PC ,with no battery.
2.I suggest you carrying out the battery, and pulg the usb cable to have a try. (purpose:check if the battery was short. if it works with no battrey, maybe you need to change a battry; if it still not work, maybe the power circuit need to be checked . )
3.if you bought it from seeedstudio and you need our checking and repairing, pls emil me: [email protected]
thanks.