Hi,
My DSO Nano v2 got a short circuit in the probe. It almost ruined the circuit I tested. I found that the 3.5mm probe connector inside the unit was flawed, so I desoldered it and replaced it with two wires and an external connector. In the process the battery also short circuited a couple of times because it was poorly soldered. Then when everything was working I had a really hard time getting the cover back on because it was so tight (not because of my modifications).
For the next version I recommend the following:
-more reliable probe connectors
-better soldering/solder layout of the battery
-larger screws for the cover and PCB
Regards,
Blanco 