Hi - I received my DSO Nano yesterday and had the same problems others mention in this thread:
After charging for multiple hours, the Nano would turn on but showed minimal battery and then quickly died 1-2 minutes later. It also wouldn’t turn on and show “USB” for the batter power indicator – so it appeared that minimal charge was reaching the Nano.
In my case, I think the USB cable I also purchased from Seeedo was to blame. When I switched to a different mini USB cable (a white one from a Cannon camera), it worked fine. Powers up in USB-power mode and charges full.
A separate minor nit: my battery came with a small connector spliced in. While gently figuring out how to orient the battery and connector in the case, the positive terminal broke loose. I ended up cutting the connector off and soldering the battery directly to the board as others have done with earlier models.
Otherwise all is well and I’m happy with my new DSO Nano.
Thx!
Dan