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  1. #1
    RC Racer
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    help please , lipo cutoff for stock e-revo with 2s1p packs.

    my friend got the e-revo and we bought two lipo battery packs 2s1p 4000mah 25c , what do you recommend for lipo cutoff so we do not destroy our batteries ??? thanx in advance .....
    Master of Greek bashing

  2. #2
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    Novak smart stop 2S or 4S.

  3. #3
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    4s - that's if the batteries are wired together in a series, right?

    2s - that would be to put on one of the 2s1p packs...presumably the BEC side battery because it will drain a little faster, right?

  4. #4
    RC Turnbuckle Jr.
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    Quote Originally Posted by GotRevo?
    4s - that's if the batteries are wired together in a series, right?

    2s - that would be to put on one of the 2s1p packs...presumably the BEC side battery because it will drain a little faster, right?
    No....4s if you run parallel....2s if you run series...

    the E-revo FAQ is your friend. LINK


    look at post #72;
    http://monster.traxxas.com/showpost....4&postcount=72


    all the wiring diagrams you need for what you are doing
    be nice.

  5. #5
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    i will connect them in series 14.8v , and i want to ask why the bec side battery discharges quicker .
    r u sure about that ,?
    so i only need a 2s cutoff. ?
    , ok but somewhere i read that the novak cutoff some incompatibility issues with the evx .
    Master of Greek bashing

  6. #6
    RC Turnbuckle Jr.
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    Quote Originally Posted by Andreas_BL
    i will connect them in series 14.8v , and i want to ask why the bec side battery discharges quicker .
    r u sure about that ,?
    so i only need a 2s cutoff. ?
    , ok but somewhere i read that the novak cutoff some incompatibility issues with the evx .

    the bec side discharges quicker because that is the side that powers your servos, and receiver along with the motors....the other side just powers the motors IIRC.

    look at the links I sent you.... the diagrams will set you up correctly depending on the way you decide to go.

    If it were me....I'd want to protect both batteries, so I'd wire using a 4s LVC.


    but in reality...i sold my evx-2 before I ever ran it and went to a brushless set-up with an ESC that had a cut-off built in....so my first hand knowledge here is limited. I do know, however, that the wiring diagrams in the e-revo faq are spot on.
    be nice.

  7. #7
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    I was told by someone on here that the "2S car lipo deep discharge protector" that True RC sells works good. Just connect it to the battery on the BEC side of your ESC, as that battery will drain faster than the other, thus protecting both batteries. I have mine ordered and waiting for its arrival so I haven't tried it out yet, but the reports I have heard are good.

    Linky (you need to click on "Connectors & Misc", then scroll about halfway down the page):
    http://home.comcast.net/~truerc/read...eady_packs.htm
    Welcome to GnarCal!

  8. #8
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    I looked at the manufacturers website for the CellShield and at the bottom of the product page it said this:

    "CellShield is intended for aircraft with 0-100% style one direction only throttle. A future product will be aimed at cars."
    Welcome to GnarCal!

  9. #9
    RC Racer
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    Quote Originally Posted by Self Medicated
    I looked at the manufacturers website for the CellShield and at the bottom of the product page it said this:

    "CellShield is intended for aircraft with 0-100% style one direction only throttle. A future product will be aimed at cars."
    U R 100% right . i must send him an e-mail to abort .. thanx a lot
    Master of Greek bashing

  10. #10
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    so , what about the novak cut off , ? is it compatible with the evx-2 ????
    Master of Greek bashing

  11. #11
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    I don't know about the Novak Smart Stop, but here is a link to some ebay sellers that have the deep discharge protector I mentioned earlier:

    http://toys.shop.ebay.com/items/_W0Q...R&_osacat=2562

    Only good reports from users so far.
    Welcome to GnarCal!

  12. #12
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    cool , i ll try one of those , lot cheaper 2..
    Master of Greek bashing

  13. #13
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    Threshold for deep discharge protection : 2.6V/Cell, 2.85V/Cell or 3.1V/Cell (Correspondingly, the total threshold for a 2S Li-Po battery pack is 5.2V, 5.7V or 6.2V)

    what about that ??? i think the best setting is the 3.1v per cell just to be safe. what do you think ????
    Master of Greek bashing

  14. #14
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    Quote Originally Posted by Andreas_BL
    Threshold for deep discharge protection : 2.6V/Cell, 2.85V/Cell or 3.1V/Cell (Correspondingly, the total threshold for a 2S Li-Po battery pack is 5.2V, 5.7V or 6.2V)

    what about that ??? i think the best setting is the 3.1v per cell just to be safe. what do you think ????
    Correct. I talked to Dan at True RC and he recommended using the highest setting.
    Welcome to GnarCal!

  15. #15
    RC Turnbuckle Jr.
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    GotRevo?, I answered your question in the other thread
    Project: BL Revo Race Quad & BL G-Maxx G3R CF Revo

  16. #16
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    And I may be wrong for doing so, but I hold your opinion in high regard.


  17. #17
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    ^
    Yup, both packs must be fully charged and balanced before using. Never run a pack that was already used or drained with a fully charged pack.

  18. #18
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    Skeppley, I think you may be right... the above diagram shows a series/parallel circuit and if I understand the evx2's innards.. you'll be showing the full series voltage on the bec side of the esc. As Chinsy as these esc's are, I doubt the bec is designed to handle that full voltage here.. but then, I know some have used it, just don't know how well they've held up.
    Edit:, after looking at my comments I realized that all legs of the ckt are series, no parallel.. sorry about that, that is, the batts are wired series outside of the esc, and the internal wiring of the esc is series. Personally I don't see any pluses to wiring this way.
    Last edited by fmj40; 03-12-2009 at 09:20 AM.
    Reformed nitro operations specialist..

  19. #19
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    Yeah, your better off just using a 2S cutoff on the BEC side. That way the internal BEC is still gonna get the factory voltage.

  20. #20
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    Quote Originally Posted by skeppley
    Yeah, your better off just using a 2S cutoff on the BEC side. That way the internal BEC is still gonna get the factory voltage.
    That was kinda what I thought, as the series setup doesn't give full low voltage protection anyway, you might as well go with the lvc on bec side option since thats closest to the default setup.

  21. #21
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    I tried this in two different trucks and the Jumper idea didn't work for me....I ended up doing the one sided LVC with the 2s Novak Smart-Stop.....worked until my motors burnt out. Now I'm BL in both.
    4x4 Slash/E-Revo/E-Maxx Castle all around

  22. #22
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    when i start running lipo batteries i still want to use my nimh packs to for running in water and stuff wut is there a way to disable the LVC without switching a bunch of wires around. or opening the waterproof reciver box every time. (thats where i plan on putting the LVC at) if u add a switch in on the LVC - wire would that disable it or would that stop the truck completley.

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