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  1. #1
    RC Qualifier SkidMan's Avatar
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    ESC required ''C'' rating??

    I can't find the spec for the X-Maxx ESC....how many amp this esc have?I check to bought somme 5000mah 3S battery and i need to know the best C rating for the X-Maxx esc!!
    -Blue X-maxx
    -E-Maxx 60.2mph
    -Spartan 48.2mph

  2. #2
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    C rating depends on the capacity of the cells, there is no set C rating that an ESC requires. For instance a 40c rating on a 5000mAh pack is good for 200A, while a 20c rating on a 10000mAh pack is also good for 200A.

    You just need to know the Amp rating of the ESC.
    I need R/Cers anonymous.

  3. #3
    RC Turnbuckle Jr. Wolfslash16's Avatar
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    Given how large the motor and ESC are, I would try for 50c or higher at least just to be safe. The Traxxas batteries are only rated for 25c, but they're underrated, so they're closer to a 50c. The higher C rating the better you'll be off IMO.
    Is owning 27 RC's too many? No way!

  4. #4
    RC Qualifier SkidMan's Avatar
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    Quote Originally Posted by RobWilJas View Post
    You just need to know the Amp rating of the ESC.
    Thats my question!!!

    How many amp the stock esc draw???

    Sorry for my English its my second language!!
    -Blue X-maxx
    -E-Maxx 60.2mph
    -Spartan 48.2mph

  5. #5
    RC Turnbuckle Jr. Wolfslash16's Avatar
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    Quote Originally Posted by SkidMan View Post
    Thats my question!!!

    How many amp the stock esc draw???

    Sorry for my English its my second language!!
    Oh my bad.

    Traxxas hasn't given us any specs that detailed on the ESC, or at least that I know of or can find.
    Is owning 27 RC's too many? No way!

  6. #6
    Traxxas Employee TireSlinger's Avatar
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    The smallest battery we suggest running is the 2872X 5000mah 11.1v 25c Traxxas LiPo.

    As Wolf stated C rating can vary widely from company to company, so if you're running non-Traxxas batteries I don't have a specific suggestions except make sure they're high quality cells capable of supplying enough amperage for a high power vehicle.
    Our doubts are traitors, and make us lose the good we oft might win, by fearing to attempt.

  7. #7
    RC Competitor
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    I just ordered the ID 8400 for my maxx. Will the 25c rating be enough?
    Pede Xmaxx Merv 1/18 Rally Blast Spartan M41 Aton

  8. #8
    RC Champion
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    Yes it's plenty. Traxxas recommends their 5000mAh 25c packs or better. 5000mAh x 25c = 125A. The ones you ordered are 8400mAh x 25c = 210A so you're fine.
    I need R/Cers anonymous.

  9. #9
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    So they are gonna be slower than the 5000 50c I have now?
    Pede Xmaxx Merv 1/18 Rally Blast Spartan M41 Aton

  10. #10
    RC Qualifier SkidMan's Avatar
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    No slower......its the voltage that give speed not the mah or amp!!!

    5000mah x 50C= 250A
    -Blue X-maxx
    -E-Maxx 60.2mph
    -Spartan 48.2mph

  11. #11
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    Quote Originally Posted by 00ttvr6 View Post
    So they are gonna be slower than the 5000 50c I have now?
    Not if they're the same cell count, as in 2s or 3s. The cell count or "s" is what determines the speed, provided they can supply the current required. What are the packs you have now?

    With LiPos, the "s" is the number of cells in series, which is what determines the voltage of the pack, which is what determines the top speed. A "2s" pack has two 3.7v nominal cells in series, so it has a total nominal voltage of 7.4v. A "3s" pack has 3 cells in series, so it would have a total nominal voltage of 11.1v.

    The "c" rating is the discharge or Amp capability of the cells. You take the cells mAh rating and multiply it by the "c" rating. So your 5000mAh 50c packs would be rated for 250A. 5000mAh is 5Ah, so 5Ah x 50c = 250A. The Traxxas 8400mAh 25c packs would be rated for 210A. 8.4Ah x 25c = 210A.

    As long as both can supply the current required for the truck (210A is plenty), and the voltage is the same, they should both give you the same top speed.
    I need R/Cers anonymous.

  12. #12
    RC Racer Killroy's Avatar
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    The higher the better, dont skimp on cheap lipos.

  13. #13
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    Powerhobby 6500mah 100c

    Quote Originally Posted by Killroy View Post
    The higher the better, dont skimp on cheap lipos.
    Would it be OK to run powerhobby 6500mah 100c batteries in stock xmaxx?

  14. #14
    RC Champion nickruger's Avatar
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    Quote Originally Posted by portallenboy View Post
    Would it be OK to run powerhobby 6500mah 100c batteries in stock xmaxx?
    Yes

    Sent from my SM-N960U using Tapatalk

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