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Thread: Batteries finish race?

  1. #1

    Default Batteries finish race?

    Do you think this battery run in series to make 4S is enough to finish a impba sanctioned race?


    Graphene 2.0 70C LiPo Batteries
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  2. #2

    Default

    We need to know the capacity of the battery and what class you're running in order to help you.
    TOY BOAT RACER
    IMPBA Dist.13 Director
    IMPBA National Records Director 2009-2019
    IMPBA 19887CD
    NAMBA 1169

  3. #3

    Default

    Graphene 2s
    6000 mah
    70c-140c
    I bought them to race in P limited hydro and cat. I thought 4S in parallel would be too heavy.

  4. #4

    Default

    6000ma should be ample for a "P" ltd setup. It also depends on how aggressive you are with propellers. Before you assume that a parallel setup would be too heavy try it in actual heat racing. I have several 5000 to 6000ma 2S batteries for series and find that my parallel 3000 and 3300ma (6000-6600ma total) though heavier will outperform especially in laps 3-6. Next do not fall for advertising "hype". There are no industry standards for C ratings. Stay with recognized brands that are used in competition.
    Mic

    Mic Halbrehder
    IMPBA 8656
    NAMBA 1414

  5. #5

    Default

    Quote Originally Posted by HTVboats View Post
    6000ma should be ample for a "P" ltd setup. It also depends on how aggressive you are with propellers. Before you assume that a parallel setup would be too heavy try it in actual heat racing. I have several 5000 to 6000ma 2S batteries for series and find that my parallel 3000 and 3300ma (6000-6600ma total) though heavier will outperform especially in laps 3-6. Next do not fall for advertising "hype". There are no industry standards for C ratings. Stay with recognized brands that are used in competition.
    Mic

    I'm a little worried now and should ofwent with the 4S in parallel.. I'm thinking that my lvc will kick in before the race is done. Do you have an idea of how long 6 laps usually takes say with a p spec hydro? Just a ballpark number would be great.
    Truckpull gave me a lot of good information on batteries that's why I went with this brand. He did mention that I should go with two 4S in parallel.

  6. #6

    Default

    The Giant Power packs are about the best packs for FE boats.
    2 -2S -6000mAh packs in series will give you a 4S - 6000mAh

    A Cat and a Sport Hydro will use a lot less Amps then say a Mono.

    A Spec Sport Hydro race takes less then 2 minutes.
    30 sec. for a slow mill lap then 90 sec. MAX of racing.
    So 6000 mAh should be lots unless you have a very poor setup.

    As MIC stated above, you may need 2 - 4S packs for balance, or weight.

    Give your setup a try first before going to the 2 -4S packs.

    I myself used 2 - 5000 2S packs in series for years. in my P Spec Sport Hydro.

    Larry
    Past NAMBA- P Mono -1 Mile Race Record holder
    Past NAMBA- P Sport -1 Mile Race Record holder
    Bump & Grind Racing Props -We Like Em Smooth & Wet

  7. #7

    Default

    I'm thinking that my lvc will kick in before the race is done. Do you have an idea of how long 6 laps usually takes say with a p spec hydro? Just a ballpark number would be great.....
    If you cannot finish a 6-lap heat in 2 minutes on decent water you have other problems. My Limited Motley Crew used around 3500 mAh in a 6-lap heat plus mill, heck even my full-P Cheetah normally used around 4500-5000 mAh. Your 6000 packs will be fine.


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  8. #8

    Default

    I bought 4 battery alarm buzzers one for each battery. I'm thinking of setting them at 3.8 do you think I should go any lower than that?

    Jerry

  9. #9

    Default

    You can do if you are short on run time for sure. The commonly recommended compromise between runtime and battery lifespan is to leave 20% in the battery, which will be a resting voltage of 3.7V/cell, voltage drop during use means that the alarm would need to be set to less than that so they recover to 3.7 after use.

    A cutoff at 3.8V/cell will probably hit when you have used somewhere in the region of half your pack's capacity and your packs will last longer than most peoples that run to a cutoff.
    Paul "tug Killer" Upton-Taylor, Cat lover.
    FastElectricBoats.co.uk

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