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  1. #1
    RC Racer ThatTraxxas's Avatar
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    What does 50C and 25C mean?

    Hello,
    I have never used lipos and will be buying some soon. For example, I have seen the Traxxas xmaxx ones as 25C and aftermarket ones as 50C. What is the difference and is it better to have higher or lower C rating?
    Thanks
    1/16 E-Revo VXL, Bandit XL-5 Just Gonna Send It!!

  2. #2
    RC Qualifier Calebs0615's Avatar
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    Its a discharge rate. Say you have a 45c battery and an esc that has a rating of 60c. Your battery would be a bottleneck and wouldnt let your esc work to its full potential.

    By the way i think for a regular 3 or 4s esc, 60c is a lot. But i could be wrong. Its always better to have more "c" on your battery because your esc will only pull what it needs.

    I hope that helped some.

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  3. #3
    RC Champion RCWilly's Avatar
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    Yes, it is the discharge rate. Generally speaking, the higher the better, but once you clear the max amperage the ESC needs, higher C ratings don't do much more. The discharge rate also depends on the capacity (mah) of the battery, and the larger the capacity, the higher the discharge rate. To calculate the discharge rate (amps), multiply the C-rating by the amp-hour of the battery:
    C-rate x mah/1000 = amps

    For example, a 25C 5800mah LiPo has 25C x 5.8ah = 145 amps; a 50C 5000mah LiPo has 50C x 5ah = 250 amps

    To determine whether the discharge rate of the battery is sufficient for your ESC, first, check the ESC's continuous current. The discharge rate of the battery should be 20% to 30% higher than the continuous current of the ESC (acts as a buffer).

    For example, the Hobbywing Max10 SCT ESC has a continuous current of 120 amps, and you are planning on using a 25C 5800mah LiPo. The discharge rate of the LiPo is 145 amps (calculated above), so 145/120 is roughly 1.21, or about 21% higher. 21% clears the 20% the battery won't be limiting the ESC in terms of current supply.

    Note: Voltage does not affect the discharge rate, so 2s, 3s, or any cell LiPos with the same capacity and C-rating have the same discharge rate.
    Everyday's a gift, thus now is called the present.

  4. #4
    RC Racer ThatTraxxas's Avatar
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    Thank you so much! Are Venom batteries good? They are cheap but cheap stuff can be trash so idk.
    1/16 E-Revo VXL, Bandit XL-5 Just Gonna Send It!!

  5. #5
    RC Competitor
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    Quote Originally Posted by ThatTraxxas View Post
    Thank you so much! Are Venom batteries good? They are cheap but cheap stuff can be trash so idk.
    Venom batteries are very good. I run 1300 mAh Venom 3 cells with a 20C discharge in my MERV and they work great.


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    What does this do- Oh whoops I broke it

  6. #6
    RC Champion RCWilly's Avatar
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    Quote Originally Posted by ThatTraxxas View Post
    Thank you so much! Are Venom batteries good? They are cheap but cheap stuff can be trash so idk.
    I have only had experience with Traxxas LiPos, but if I were to get more LiPos, I would go with SMC:

    https://www.smc-racing.com/index.php...product_id=619

    https://www.smc-racing.com/index.php...product_id=620
    Everyday's a gift, thus now is called the present.

  7. #7
    RC Racer ThatTraxxas's Avatar
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    Quote Originally Posted by TwinTurboV8 View Post
    Venom batteries are very good. I run 1300 mAh Venom 3 cells with a 20C discharge in my MERV and they work great.


    Sent from my iPhone using Tapatalk
    Thank you. I don’t think SMCs are available in Canada unfortunately.
    1/16 E-Revo VXL, Bandit XL-5 Just Gonna Send It!!

  8. #8
    RC Champion grizzly03's Avatar
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    Quote Originally Posted by ThatTraxxas View Post
    Thank you. I donít think SMCs are available in Canada unfortunately.
    They are. SMC lists a Canada International Sales Dealer:

    Bego Racing
    Candiac
    Quebec

    Email: begoracingrc@gmail.com
    Website: http://begoracing.com/shop/

  9. #9
    RC Racer
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    I just got 2 of the SMC's 2S for 20 bucks each, I really like them. They plug right into the trucks and the Traxxas live peak charger.
    3Rustler 2wd(VXL) 1Rustler 4x4VXL 1Slash VXL Fox

  10. #10
    RC Racer ThatTraxxas's Avatar
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    Quote Originally Posted by grizzly03 View Post
    They are. SMC lists a Canada International Sales Dealer:


    Email: begoracingrc@gmail.com
    Website: http://begoracing.com/shop/
    That’s all in French lol. I speak French but not that well... plus it’s prob $100 for shipping
    Jesus that got ugly
    Fixed it
    Last edited by ThatTraxxas; 02-18-2021 at 01:33 PM. Reason: Ugly text
    1/16 E-Revo VXL, Bandit XL-5 Just Gonna Send It!!

  11. #11
    RC Racer
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    Quote Originally Posted by RCWilly View Post
    I have only had experience with Traxxas LiPos, but if I were to get more LiPos, I would go with SMC:

    https://www.smc-racing.com/index.php...product_id=619

    https://www.smc-racing.com/index.php...product_id=620
    Same here, been using traxxas Lipo's, When I have to buy more batteries, I'll go with SMC.

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