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Cold Weather Inspire Deaths

Discussion in 'Inspire 1 Discussion' started by damoncooper, Jan 24, 2016.

  1. damoncooper

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    I've counted something like 4 reported "dropped from the sky" cold weather induced battery failures and Inspire deaths in just the last 3 days.

    All using FW 1.6. All using fairly new battery packs (<20 cycles apparently), all pre-warmed to 20C or higher. All fully charged before flight.

    These guys did everything right. Yet. Battery death occurred and their aircrafts dropped from the sky without warning. Two examples below.

    Not good.

    Discuss.


    ImageUploadedByTapatalk1453652858.222196.jpg
    ImageUploadedByTapatalk1453652867.757273.jpg
     
  2. Zyg0te

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    Question is at what point it dropped. I flew mine in -20 celsius a few days ago and I noticed the battery level dropped extremely fast once it got around the 30% mark. Out of curiosity I let it hover over a field with about 1 meter of fresh snow as I had to drain the battery to 5% anyway. At around 10% it just suddenly dropped without warning.
     
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  3. damoncooper

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    As I posted in the battery mod thread:

    Ok I've tested full main TB48 battery shutdown while in flight with the aux batteries attached with the battery mod and - as expected - the Inspire keeps on flying albeit with a battery error on app. I had full control of the aircraft even though the main TB48 was OFF.

    Bring on the DJI battery failures. I'm ready.

    Loving my battery mod. Especially with reports of Inspires dropping from the sky due to battery failure and my very expensive X5R on preorder!
     
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  4. gruvpix

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    I have been flying quite a bit lately, in temps between -20 and -5 Celsius, so this thread is pretty worrying!
    That said I have noticed absolutely no voltage drops on the latest FW version whereas before I used to get them somewhat often. Minus the whole d-log softness issue, this FW version (1.6) has been the best yet for me
     
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  5. Droider

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    What do the logs of these crashed Inspires reveal?
     
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  6. damoncooper

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    Two showed critical battery level warning right before dropping out of the sky.
     
  7. Droider

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    And I am guessing that was from a healthy 40/50% to critical in a matter of seconds?
    If so DJI will need to replace them as if they were on 1.6 with all the batteries on the latest FW they still ain't got it right..
     
  8. damoncooper

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    Correct and yes I would expect so
     
  9. FlyHighUSA

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    This is curious to say the least but I personally am not having any issue with battery voltage dropping suddenly. Although it is a distinct possibility for something like that to happen I have not encountered this yet. Reduce flight times doesn't bother me in cold weather as I expect that but sudden voltage drops and birds falling out of the sky is something no one wants Will monitor closely and report back.
     
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  10. FlyHighUSA

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    Omg man that is terrible. I'm sorry to hear that. It will be interesting to see the data pulled from your bird. I hope it gets resolved soon. Terrible day!
     
  11. damoncooper

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    Can you possibly pull the flight record from the GO app (use iTunes if on iOS), and upload it to the healthydrones.com site for analysis?

    Post back here the screen shots of the flight analysis if you don't mind and maybe we can get a but more insight into what happened.

    Very sorry to hear this.
     
  12. The Editor

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    This 'sounds' very much like a faulty cell in the pack.
    Did you open the battery monitor page when you got the message?
    Was one cell much lower than the rest?
    If one cell dips below around.d 2.89v the back will shut down hitting LVC.
     
  13. Droider

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    Thats should just not happen! Yes big flashing warnings but total shut down because one cell is dead is crap. Save the AC but most importantly enable the AC to descend and land 'SAFELY'. not just drop out of the sky. It would be better if DJI wrote the algorithm to descend at a safe decent rate rather than cut the power.
     
  14. Droider

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    @timmywah Do you have the logs off your tablet. Id so stick it up here and we can have a look. Healthydrones have a really good battery diagnosis section.

    We also have to remember that these incidents however horrible they are are still few and far between in the grand scheme of things. Healthydromes now have over 200,000k logged so in the real world there must be millions.

    Please keep us updated as to just what DJI come back with. Sorry for your failure. Been there and know just how it affects you. Long live WKM. Fly safe.
     
    #14 Droider, Jan 26, 2016
    Last edited: Jan 26, 2016
  15. The Editor

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    I am not saying it's right (I would rather destroy a $200 pack but get my aircraft back) but just advising that's the way DJI has set the pack shutdown.
     
  16. Droider

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    Roger that, I know that Editor. Would be just good to understand DJI's rationale behind it.
    I would rather the whole AC vaporised rather than fall like a brick to save a pack!
     
  17. Droider

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    EKK! So hopefully DJI will replace the pack and the copter for free. Have yopu got the full battery history in Healthy drones?
     
  18. The Editor

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    The pack (and software) can't report on individual cell temperatures since there is only one sensor in the middle of the pack.
    The cells have no way of reporting their individual temperature only voltages.
    What that guage is saying is the overall temp went to 130f and there were fluctuations in cell one's voltage relative to the others.
    Were you not monitoring your battery temp and cell levels during your flight?
     
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  19. filmscum

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    Man I hate hearing this! So bummed for you. Hopefully they will replace everything as it's pretty obvious the battery failed. I noticed after a flight yesterday that one of my packs is exhibiting the same behavior in cell 1 as well and looking back at the flights history has done it every time. I'm still in the break-in period and haven't flown it past 48% (only 5 flights on it so far). I'm definitely not using this pack again. Will be
    sending it in but not counting on a replacement....

    batt info.jpg
     
  20. Mad_angler1

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    Just some information

    Iv seen a lot of healthy drones reports with cell 1 deviations, I'm not saying it's not an issue but see it on flights with absolutely no problems.
     
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