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P3 flight battery will be a 4S 4480mah 15.2v

Discussion in 'Pro/Adv Discussion' started by thestone11, Apr 8, 2015.

  1. thestone11

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    Since it is a 4S, wondering will that change the body size of the P3? Interesting......
     
  2. N017RW

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    The P3 is the same size physically. This maximizes profit margin.

    I also believe a 4S LiPo is rated at it's nominal voltage which is 14.8v not 15.2v.

    Lower capacity (and maybe some slight improvements) reduces cell size allowing them to squeeze in 4 cells.
     
  3. thestone11

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    Yup 4S is 14.8v but oddly enough, I got the voltage from the DJI website.

    [​IMG]
    [​IMG]
     
  4. Morgon

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    So... stupid question: Would this mean that the 3S batteries are wholly incompatible, or do you think they'd work, but just with lesser flight time?
     
  5. gfredrone

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    FAQ says P2 batteries cant be used with P3
     
  6. N017RW

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    Acknowledged.

    Seems fishy to change the nominal volt/cell rating method between P2 and P3.

    Maybe to 'sound or look' better???
     
  7. walko

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    but... now 23 minutes... before (p2v) 25 minutes... I don´t know why use 4S then...
     
  8. NH Phantom

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    So they can sell a bunch of new batteries. Why else/
     
  9. gppms

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    Lightbridge has extra power consumption.
     
  10. shartlza

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    But can a P3 battery be used in a P2??
     
  11. Meta4

    Meta4 Moderator
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    Of course not ... different voltages and probably different fit to ensure people don't mix them up.
     
  12. N017RW

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    No.

    There is no forward or reverse compatability.

    The P2 is 3S (11.1V) the P3 is 4S (14.8v).
     
  13. thestone11

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    According to DJI spec sheet for the phantom 3: it is 15.2V

    [​IMG]
     
  14. N017RW

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    Yea I know.

    I've been using LiPos for about ten years and those numbers are atypical specifications.

    Look up any 4S LiPo [nominal] voltage and get back to me.

    DJI has decided to spec. it at a different charge level.

    This same level would spec. the P2 Batt. an 11.4v, atypical.
     
  15. thongbong

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    Most likely the p3 is heavier and to compensate for the weight/flight-time ratio, a whole new power system is used, one that requires more amps, discharge rating hence 4 cell instead of 3.
     
  16. Meta4

    Meta4 Moderator
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    It's about the same weight ...
    Weight (including battery and propellers)
    1280 g
    It just has a lot going on, powering lightbridge etc and needs more juice.
     
  17. thongbong

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    that's a dollar a gram! (almost)
     
  18. Meta4

    Meta4 Moderator
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    Bargain ... gold is $38/g
     
  19. gecarey

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    But Gold can be melted down and re-used..... forever.... DJI Lipo... not so much
     
  20. Entropy512

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    Hmm, one question would be, what would the nominal voltage be on the new LiPo chemistry that has a peak charging voltage of 4.35v/cell instead of 4.2v/cell?

    These have been showing up in phones since early 2013 (Oppo Find5 had a 4.35v cell, so does Find7 and Sony Xperia Z3) - these cells might have a 3.8v/cell nominal rating instead of 3.7.

    At least some people rate the 4.35v cells with a nominal of 3.8 instead of 3.7 - http://www.highpowertech.com/product_096ffc299200f517.html

    That might be another reason DJI broke compatibility, if they switched to a new chemistry, they would have had to stick with incompatibility even at 3S.