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Thread: 3903 emaxx lipo

  1. #1
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    3903 emaxx lipo

    Bought a used emaxx. Has vxl2 esc doesn't say it has lvd. One hobby shop said get a lvd alarm and run Lipo. The other says not to use lipo. Now im confused. It has all stock setup with the dual 550's. Going to buy another set of batteries Carlisle se I only have 1 set. Would rather get lipos now if it won't hurt my system.

  2. #2
    RC Turnbuckle Jr. Jimmie Neutron's Avatar
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    EVX2... that is what I assume you meant to type?

    If so, and it does not state Low Voltage Detection on it, a LiPo alarm will work just fine.
    Whatever it is I just said... I could be wrong.

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  4. #4
    RC Turnbuckle Jr. Jimmie Neutron's Avatar
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    It didn't with the XL5 I tried it with... then did a little research and found they don't work well with Traxxas ESC's.

    Here is what I recommend... it is adjustable, loud, and has a LCD readout-

    Overseas:
    http://www.ebay.com/itm/1-8S-LED-Lip...item1e7a97dc3f

    State side:
    http://www.ebay.com/itm/NEW-1-8S-8s-...item564f8662aa
    Whatever it is I just said... I could be wrong.

  5. #5
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    Does this go inline on the car? If not what do you use on the truck?

  6. #6
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    New to Lipos

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    RC Turnbuckle Jr. Jimmie Neutron's Avatar
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    The alarm connects to the balance lead of the LiPo. The balance lead is directly attached to each and every individual cell within the pack, giving you a direct connection to your cells.



    The alarm is connected to this lead while you are using your RC. It also must be secured (I used 3M dual lock) to the chassis to keep the connector from unplugging from the alarm.
    Whatever it is I just said... I could be wrong.

  8. #8
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    What's a good setting for a 7.4 volt 2s pack? I'm going to do some reading on Lipos, when I find some, I have a used TMaxx coming that comes with 2 lipos

  9. #9
    RC Turnbuckle Jr. Jimmie Neutron's Avatar
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    I find that interesting... a tMaxx that comes with LiPo! lol


    I set mine to no lower than 3.4v/cell.
    Whatever it is I just said... I could be wrong.

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    Sorry, I own a TMaxx, bought a EMaxx

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    I use the older 2s novak cut off, It's a little low on the cut off, the warning is pretty low too. But normally now when i finish my runs the cells are at 3.6V. I've only hit the cut off once, the warning a four or five times.
    Guide books aren't part of the packaging.

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    SO I would need 2. 1 for each pack on my emaxx right?
    Last edited by cbr310; 07-27-2013 at 01:28 PM.

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    No only one device.
    On the esc, one battery drains before the other, BEC side. This is the side that requires some sort of low voltage device.
    Guide books aren't part of the packaging.

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    What does BEC stand for?

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    Wow I have alot to learn!

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    Battery Eliminator Circuit.
    Feeds power to the reciever and servo's. So this battery would drain faster than the non bec side.
    I forgot how to test the bec side on the evx2 ?.
    I think, it's power on, then unplug one battery if light stays on a very short time thats bec side. If it goes out straight away that's non bec side and that's the side that needs the alarm or whatever you connect up. The alarms plug into battery, the novak cut off gets soldered to the esc wires. Bit more fiddly and more expensive.
    Guide books aren't part of the packaging.

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    Battery Eliminator Circuit.
    Feeds power to the reciever and servo's. So this battery would drain faster than the non bec side.
    I forgot how to test the bec side on the evx2 ?.
    I think, it's power on, then unplug one battery if light stays on a very short time thats bec side. If it goes out straight away that's non bec side and its bec the side that needs the alarm or whatever you connect up. The alarms plug into battery, the novak cut off gets soldered to the esc wires. Bit more fiddly and more expensive.
    Guide books aren't part of the packaging.

  18. #18
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    Quote Originally Posted by Jimmie Neutron View Post
    It didn't with the XL5 I tried it with... then did a little research and found they don't work well with Traxxas ESC's.

    Here is what I recommend... it is adjustable, loud, and has a LCD readout-

    Overseas:
    http://www.ebay.com/itm/1-8S-LED-Lip...item1e7a97dc3f

    State side:
    http://www.ebay.com/itm/NEW-1-8S-8s-...item564f8662aa
    +1 on these. They are also good to keep a eye on lipo voltage when you store lipos. I check all my lipos every couple days when stored.

    Correct me if im wrong please, but isnt the bec side have a red tag on the wires. Sorry its on my summit. The red tag only stats always disconnect when not in use. It also has unplug this side to turn off esc.
    Last edited by ajcar; 07-27-2013 at 05:00 PM.
    I'm not krazy. My mother had me tested.

  19. #19
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    Your right it's the red tag side, but if it has been removed you need to test it.
    Guide books aren't part of the packaging.

  20. #20
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    Test how?

    Sent from my GT-P5113 using Tapatalk HD
    USAF, Retired
    ERBE, Dewalt EMaxx, Rustler VXL

  21. #21
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    By switching it on then removing one battery. Then start again and remove other battery.
    The side where the led stays on the longest is bec side. I think that's how I done it few years back.
    Guide books aren't part of the packaging.

  22. #22
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    Quote Originally Posted by vwdaveb View Post
    Test how?

    Sent from my GT-P5113 using Tapatalk HD
    another way is buy 2 of these http://www.ebay.com/itm/NEW-1-8S-8s-...item564f8662aa hook them up. 3m tape them somewhere. I had mine on top of my servos. Then what ever one drains more will be the bec side.

    Also look at my picture, and look at the wires. you can see the first black wire goes to the plug with the red tag on it.
    Last edited by ajcar; 07-28-2013 at 06:16 AM.
    I'm not krazy. My mother had me tested.

  23. #23
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    Why would you need to buy two. ? There is only one bec side.
    Guide books aren't part of the packaging.

  24. #24
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    Then just keep checking temps while running the Lipo? Should I get heat sinks or fan for my esc or motors?

  25. #25
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    Yep, you need to check temps running the lipo, I'm not sure how much the 550's hold up to lipo compared to nimh. You may need different gearing.
    As for heat sinks and fans. I'm not a big supporter of them, Unless your pushing the limits of what the setup can take.
    Keep the temps in control with gearing.
    Check temps always when playing with gears, battery supplies and also when driving on a new terrain. Or even just once in a while even if you already have it all set up.
    Guide books aren't part of the packaging.

  26. #26
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    The LVD's linked above are for 8s.

  27. #27
    RC Turnbuckle Jr. Jimmie Neutron's Avatar
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    Up to 8S... not only 8S.
    Whatever it is I just said... I could be wrong.

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