QUAD only works with USB, post/red is on bottom

Products & Technology DSO Quad
5

hello,
leave out the LED , let’s we check the cause of your Quad not working the battery.

  1. please open the back cover of Quad, you have done this work when you installed the battery.
  2. after charging for about 1h, please check the output the battery(the red wire or the pin close to the edge.), to check voltage .it should be about 3.7v