Walkera QR X350 Pro - Strange problem

Discussion in 'Specific Models of Quadcopters and Drones' started by Dan95363, Feb 20, 2017.

  1. Dan95363

    Dan95363 New Member

    A little while ago, I crashed my Walkera QR X350 Pro. For about 2-3 weeks now, I've had the guts of the drone out on a table while I wait for the new casing to arrive. Yesterday, I was getting a bit impatient, so I decided to get the thing hooked up to mission planner (which I obviously should have done before), and I got it to work, and it was pretty exciting. The drone seemed to work fine, and I could control the motors with my remote. However, this is where my weird problem comes in. Later that night, I tried to start it up again, and the green LED started blinking for a few seconds and then the whole thing just shut off, no startup sequence or anything. I tried recharging the battery, and the same thing happened. I should note however that I did charge the battery for about two hours, in which time the indicator light never went from blinking to solid, so it may very well be a battery issue. It probably isn't a problem originating from mission planner, because it seemed fine afterwards. In case anyone is wondering, my transmitter is a Devo (devention) 7e with deviation firmware, and my receiver is a Devo RX705. Anyways, here is a video of it happening, and any help is much appreciated Oh, also I have not done any modifications to the drone.
     
  2. RGJameson

    RGJameson Active Member

    That's why everyone in this hobby needs a $10 multimeter.
     
  3. Dan95363

    Dan95363 New Member

    I actually do have one, do you know how to test a lipo battery with it?
     
  4. Dan95363

    Dan95363 New Member

    UPDATE: I should probably mention that if I go back to the battery in the morning it will last for about a minute instead of a few seconds, but after that it will go back to how it is shown in the video.
     
  5. RGJameson

    RGJameson Active Member

    Set the scale to 20V DC and put the probes into the battery connector, red to red, black to black (it will work even if reversed but the voltage will show as '-'). I'm assuming it's a 3S liPo. Although they are listed as 11.1V, fresh off the charger they should be ~12.4 volts.
     
  6. Dan95363

    Dan95363 New Member

    Shucks, there goes another $20. Sure enough, only 5.6v in the battery. Thanks for the help :p
     
    Last edited: Feb 21, 2017

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