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DJI Battery Pack Shortcomings

Discussion in 'Inspire 1 Discussion' started by damoncooper, Feb 12, 2016.

  1. damoncooper

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    I just need to lament one more time on this topic.

    The DJI pack cells are LiHV cells, meaning they are able to take charge safely up to 4.35V per cell.

    But they are low C rated (discharge) unfortunately, which while dramatically reducing weight, is one of their fundamental shortcomings.

    In less than perfect operating conditions, or with any flaw in the cells themselves, or with unbalanced cell voltage, a voltage sag induced by temperature (hi or low outside the perfect 20C - 40C "Goldilocks Zone") and/or extra load (X5 camera, high speed maneuvers etc), can result in catastrophe, as we've seen reported many times here and elsewhere.

    Their low discharge rate, coupled with the FW bugs, extra load of the Pro and other factors has resulted in a very thin margin of error should a voltage sag occur.

    Hence the community drive to find alternatives and add redundancy to the DJI packs. (Battery Mod Info)

    DJI really needs to add an additional level of redundancy (6S3P vs 6S2P for example) and bump the C rating on the cells.

    The current situation is killing Inspire's.

    Thank you for listening :)
     
    #1 damoncooper, Feb 12, 2016
    Last edited: Feb 12, 2016
  2. FlyHighUSA

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    Sounds like a great idea!!! For now, I like you am using extra packs in order to have some redundancy. I would love to see a hex version of the Inspire! I believe the sales would be out of this world. At least we would have redundancy in the motor area of things. The battery improvement is still something that has me interested.
     
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  3. damoncooper

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    Yeah, hex would be interesting, or an octo. If they used eight motors and redesigned the landing gear and feet and added dual-battery redundancy they might be able to keep much of the basic design they currently have.
     
  4. Dr. Ifly Drones

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    They already do make these, they are called the S900 and S1000, LOL
     
  5. damoncooper

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    Yeah, hex would be interesting, or an octo. If they used eight motors and redesigned the landing gear and feet they might be able to keep much of the design they currently have.
    Hardly RTF aircraft and the technical expertise required to properly build and tune the SXXX solutions and their size, cost and bulk are prohibitive for many folks.
     
    #5 damoncooper, Feb 12, 2016
    Last edited: Feb 12, 2016
  6. John Alan

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    Been reading with interest your battery mod treads...:cool:
    Decided for me... a dual battery Matrice is one way to address the 'cold' battery issue...
    Starting down the path to add one to my fleet...

    But... Got another idea... I'll throw it out for thought... o_O

    What if the guts of a Matrice were transplanted into a bigger Quad...
    Add like 2 more batteries (4 total)
    Put a X5 gimbal mount on it... just cause you could...
    Size the frame, motors and such to haul the 4 batts plus a modest payload...
    6S8P... 22800 mAh (w.4xTB48's)

    Hmmmmm... :oops:
     
    #6 John Alan, Feb 12, 2016
    Last edited: Feb 12, 2016
  7. damoncooper

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    Seems like a lot of work :). Just add an extra battery to the Inspire. Simple!
     
  8. John Alan

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    I looked into the Matrice wiring and such with my GoogleFu...:p
    Looks like DJI is using something besides standard control wiring between the N1 and the ESC's... may be two way network comm
    Forget that... :eek:
     
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  9. Phatzo

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    not really. the onse you talk about are round type costruction and a pain to balance and make out front and back. with the "H" form you have much more space and it is way easier to balance. -so not the same.


    Sent from my iPhone using Tapatalk
     
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  10. Dr. Ifly Drones

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    Yeah so, neither you nor Damon caught that it was a joke. Yes, bring on the hex or octo H copter.
     
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  11. Phatzo

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    sorry, you wrote it in such a serious style :D :p


    Sent from my iPhone using Tapatalk
     
  12. damoncooper

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    Doh!