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  1. #1

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    Tornado EPX PRO 1/10 Buggy 8.4v NiMH Battery issue

    Hello, I have a Tornado EPX PRO 1/10 Scale Brushless Buggy that I recently purchased new. I am able to run 7.2v batteries (NiMH) ranging from 2000mah to 5000mah all day long. I recently bought an 8.4v battery (PoweriZer 4200mah) but I am only able to use the car for no more than 40 seconds before the forward and reverse sieze to operate. Also, the steeringis still operable and the ESC begins to blinks at a constant rate (red color). Once I turn off the switch and then back on, it does the same thing. It only operates for approximately 40 seconds before the ESC begins blinking again. If I switch back to the 7.2v batteries, the car works just fine.

    What can be the problem?

  2. #2
    UrcHobby's Avatar
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    RE: Tornado EPX PRO 1/10 Buggy 8.4v NiMH Battery issue

    Sounds like you got a bad pack. When they sit around to long they can go bad. Call the place you got if from and see what they can do.
    Urc Hobby Redcat Racing, HPI, Traxxas, XTM Racing, Venom, RC4WD, Integy, DDM Racing & PRP Dealer LI New York

  3. #3
    nitrosportsandrunner's Avatar
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    RE: Tornado EPX PRO 1/10 Buggy 8.4v NiMH Battery issue

    yeh, it sounds like the ESC is going into low voltage protection. In otherwords, it is detecting the battery at lower than 6v and cuts power as its time to charge the battery.

    how long is the battery taking to charge, and does you charger show how many MAH its putting into it?


    The battery could have 1 bad cell. Its been known to happen, getting a brand new battery that is defective.

    If the buggy runs fine with your other batts, then its the battery thats to blame.
    SC10rs, 1/6 hummer crawler, Kyosho Twin Force, Lunchbox project, Techone P51,

  4. #4

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    RE: Tornado EPX PRO 1/10 Buggy 8.4v NiMH Battery issue

    Funny, I left the battery intact overnight without chariging it and attempted to try one more time before I send in the battery. Apparently, it worked fine this morning. I noticed the car had a lot more power with a 8.4v battery than any 7.2v battery. I played around for half an hour before the car began dying off. I am thinking that this battery holds too much of a voltage and that is why the ESC shuts down. Or it did not charge correctly?Whatever the case might be, the car ran fine. Have you guys heard of overcharging a battery? I might need my voltmeter to see what is the final voltage once is fresh off the charger. I think is fair to say is not the battery but rather the car really technically does not support a 8.4v battery even though it states it.

  5. #5

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    RE: Tornado EPX PRO 1/10 Buggy 8.4v NiMH Battery issue

    I am using a different charger and charging at 560milliamps at 9volts would do the trick. I could have had a cell not fully charged.

  6. #6
    nitrosportsandrunner's Avatar
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    RE: Tornado EPX PRO 1/10 Buggy 8.4v NiMH Battery issue

    Glad its working now
    for every volt, that motor turns about 3000rpms. So a battery with 1 more volt does equal a fair bit more power.

    Id bet that either your battery didnt charge right before, or that the connector is poor. If the connectors were not good enough, then the power that could go threw them would be low and this would cause the ESC to go into low voltage mode.

    The epx pro's will not over heat or shut down on a 8.4v nimh or 2s lipo battery. It takes more like 3s lipo (11.1v) before the electronics get hot enough for it to shut down.
    SC10rs, 1/6 hummer crawler, Kyosho Twin Force, Lunchbox project, Techone P51,

  7. #7

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    RE: Tornado EPX PRO 1/10 Buggy 8.4v NiMH Battery issue

    I have a tamiya connector on the 8.4v battery. Do you think it can't handle the increase demand of amperage? I honestly doubt that the battery is at fault since I was able to operate once the battery died a little. I am using a banana connector adapter. Shall I install banana connectors on the battery?

  8. #8
    nitrosportsandrunner's Avatar
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    RE: Tornado EPX PRO 1/10 Buggy 8.4v NiMH Battery issue


    ORIGINAL: xCOMBATx

    I have a tamiya connector on the 8.4v battery. Do you think it can't handle the increase demand of amperage? I honestly doubt that the battery is at fault since I was able to operate once the battery died a little. I am using a banana connector adapter. Shall I install banana connectors on the battery?
    Yes, either install a banana plug on the battery or swap both to deans or traxxas plugs. Tamiya plugs a HORRIBLE. Ive seen them melt together once when used on a caldera 10e. And that truck doesnt use any more amps then your buggy. And that was with a 7.2v nimh.

    Even when tamiya plugs "feel" tight, they often have play and loose contact. Id bet thats why the ESC went into LVC mode.

    Also, while adaptors are "easy" adding more connectors is restricting power flow. Keeping connectors simple and wiring short helps the power to flow more freely.

    SC10rs, 1/6 hummer crawler, Kyosho Twin Force, Lunchbox project, Techone P51,

  9. #9

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    RE: Tornado EPX PRO 1/10 Buggy 8.4v NiMH Battery issue

    FYI, for those of you who utilize the 8.4v NiMH battery make sure to turn off the Low-Voltage Protection setting which is programmed on the ESC. That has solved all my issues. That feature is only utilized for LiPO batteries.

  10. #10
    nitrosportsandrunner's Avatar
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    RE: Tornado EPX PRO 1/10 Buggy 8.4v NiMH Battery issue


    ORIGINAL: xCOMBATx

    FYI, for those of you who utilize the 8.4v NiMH battery make sure to turn off the Low-Voltage Protection setting which is programmed on the ESC. That has solved all my issues. That feature is only utilized for LiPO batteries.
    Its true you only need it for lipos, but it shouldnt cut your nimh runtime down by that much.
    SC10rs, 1/6 hummer crawler, Kyosho Twin Force, Lunchbox project, Techone P51,


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