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  1. #1
    RC Competitor
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    XL-5 ESC question

    I'm having a problem getting my XL-5 esc set to Lipo battery mode. I follow the instructions and it doesn't change, it just turns off. Any suggestion? Thanks ya'll.

  2. #2
    RC Turnbuckle Jr. Jimmie Neutron's Avatar
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    Can you tell us what you are doing??
    Sometimes we all follow instructions to the letter only to find out later we have been doing something wrong all along.
    Whatever it is I just said... I could be wrong.

  3. #3
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    Well I plug in my battery a 2s lipo, turn on radio, then turn on esc. The light in green then turns red. I press and hold the button for way more then a min. but it doesn't beep like it's suppose to, to tell me it has changed to lipo mode. I let go and the esc turns off. I turn it on again and it hasn't changed. Because its not changing to lipo mode, the motor doesn't work most of the time. The steering works fine though.

  4. #4
    RC Turnbuckle Jr. Jimmie Neutron's Avatar
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    I cannot see where you are doing anything wrong...
    might be time to call Traxxas... that is the great thing about them - customer support!!

    oh... I just saw that you are in Korea.
    Does that effect you calling them?
    Whatever it is I just said... I could be wrong.

  5. #5
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    Not really, it isn't that bad. I'll email them first. Yeah I didn't think I was doing anything wrong buy following the manual...lol. It will change running modes though.

  6. #6
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    Well I did alot more research and have found out that the xl-5 esc that I have is a model w/o low voltage-cutoff. I think this is why she is acting up on me so much, she don't like Lipos. I know I didn't have this problem a couple years ago when I was running nimh batts. Now that I am running Lipos it's messing up. Go figure...lol

  7. #7
    Marshal ksb51rl's Avatar
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    A 2S LiPo should be no problem for an XL-5. The 8.4V maximum is much lower than the 9.6V nominal that it is rated for. You need to look elsewhere for the problem.
    Alt-248 on the number pad =

  8. #8
    RC Turnbuckle Jr. Jimmie Neutron's Avatar
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    Shouldn't be a problem... but may cause issues.
    But there isn't any issue here as a non-lvd ESC is not going to go into lvd mode. lol

    I know the XL2.5 is rated for 9.6v, but I have seen and read of quite a few puffing the magic smoke once hooked to 2S LiPo's.
    Whatever it is I just said... I could be wrong.

  9. #9
    Marshal ksb51rl's Avatar
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    But this is an XL-5. They can handle 9.6v nominal all day long.
    How does the slightly lower voltages of LiPos cause issues with an ESC?
    Alt-248 on the number pad =

  10. #10
    RC Turnbuckle Jr. Jimmie Neutron's Avatar
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    I have no idea... neither did Traxxas when I called them about mine.
    It makes absolutely no sense to me that a 2S 8.4v LiPo can fry any ESC rated for 9.6v.

    I know the 2.5 is not LiPo ready; so I added a LVA to the Boss' Boss, plugged in the LiPo, pulled the trigger, put the body on, gunned it, and then watched the smoke show.
    Whatever it is I just said... I could be wrong.

  11. #11
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    Its not the voltage that'll kill an ESC alone, the current does too.
    Just because you have a 7.2 / 8.4v lipo and the ESC can take 9.6v, that 9.6 is only on NIMH which may only deliver 100 amps.
    Lipos can deliver twice that, maybe more, so:
    Lipo 7.2 x 200 amps = 1440 watts
    NIMH 9.6 x 100 amps - 960 watts.

    Thats where the ESC could be frying.

  12. #12
    RC Turnbuckle Jr. Jimmie Neutron's Avatar
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    Thanks for the explanation, Harley.
    Whatever it is I just said... I could be wrong.

  13. #13
    Marshal ksb51rl's Avatar
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    Good explanation or not, are you asserting that a brushed motor will be pulling Kilowatts in a 1:10 vehicle? If not, would the above apply?
    Alt-248 on the number pad =

  14. #14
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    That was a rough example I gave there, whether it be true or not.
    In any case, its possible the motor could temporarily pull that high amount of amps if its available from the battery.

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