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Question? C Rating

Discussion in 'Batteries / Chargers / Power Supplies' started by Bushwacker, Mar 27, 2015.

  1. Bushwacker

    Bushwacker 3DRCF Moderator

    Just wanted to get some confirmation. C ratings are 5 amps per c right so 1C is 5amp 2C = 10 and just multiply up as you go right?
  2. Xpress

    Xpress GSN Sponsor Tier 1

    No. C rating is 1x the capacity of the pack. So for a 500mah pack, 1C is 0.5 amps.

    There are 1000mah in 1 amp, because a milli is 1/1000.

    A pack with a 30C discharge is 30x the capacity of the pack, so for a 500mah pack, that's 15 amps. Or for a 5000mah pack, that's 150 amps.
  3. Bushwacker

    Bushwacker 3DRCF Moderator

    Well crap I couldn't of been more wrong could I.
  4. The C rating can also be helpful when charging as well. As an example a pack with a capacity of 4300 mAh; a 1C charge rate would be 4.3 amps, 2C charge would be 8.6 amps, 3C charge would be 12.9 amps.......etc.
  5. Bushwacker

    Bushwacker 3DRCF Moderator

    Thanks much guys I understand now.

  6. PRC_Robin


    You can also think of C rating in terms of time, when charging or discharging. 1C = 1 hour, 2C = 30 minutes, 3C = 20 minutes, etc.

    So the next time you see a 150C rated battery, take it with a grain or two of salt. :)
  7. Xpress

    Xpress GSN Sponsor Tier 1

    The only company that I can think of that has a really truthful C rated pack is ThunderPower, though I will say my big HK 6s packs have been holding pretty true to their 30c rating. I've noticed one of them has a cell that's starting to take a dump though :banghead:

    Who would have ever thought there'd be so much info to learn about a hobby we do for fun LOL.
    Last edited by a moderator: Mar 30, 2015
  8. Bushwacker

    Bushwacker 3DRCF Moderator

    You said it brother.
  9. 3dmike

    3dmike 640cc Uber Pimp

    :) Well put Robin!
  10. cam4569

    cam4569 70cc twin V2

    so as a clarifying question to an old thread. If I have a 3000mah 3s 20C, that would be rated for 6A correct? Is that the max safe draw for the battery? I assume that the battery would provide the full voltage and power for as long as it has any charge in it (think of a direct short). Would you notice a power difference to the motor running a 40C over a 20C battery pack? Also this may be a bit off topic but if I have a 6A pack (20C 3000) why will it run a 45A esc? I have a basic understanding of electricity just trying to clarify.

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