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  1. #1
    Mdubz's Avatar
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    Easy way to determine battery polarity?

    Hey guys, just looking for a quick, easy way to determine my battery wire's polarity. Don't tell me to buy a voltmeter or something, I just want a quick easy way to determine my polarity. (Anything with light bulbs, a spare motor, etc?) Thanks.
    .::x/{x}Vendetta{x}\\x::.
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  2. #2

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    RE: Easy way to determine battery polarity?

    Hrmmm....... but wouldn't a voltmeter be oh so handy? I use mine just about every day.
    pbmax

  3. #3
    Mdubz's Avatar
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    RE: Easy way to determine battery polarity?

    Nah, this is probably going to be a one time thing, and I'm quite lazy. Theres gotta be an easy way to determine polarity...
    .::x/{x}Vendetta{x}\\x::.
    Permax||Quark33||Li-Mn
    http://www.youtube.com/watch?v=dUkI03LBF8E

  4. #4

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    RE: Easy way to determine battery polarity?

    LED + resistor will do it - it'll light up in one direction only. Pick a pretty low-ohm resistor and make sure you know the polarity of the LED.
    pbmax

  5. #5
    Mdubz's Avatar
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    RE: Easy way to determine battery polarity?

    I'll try that, but where exactly do I get a resister? :P Can I pry it from some old toy, or can I just connect it to the LED? I'll try and figure something out.
    .::x/{x}Vendetta{x}\\x::.
    Permax||Quark33||Li-Mn
    http://www.youtube.com/watch?v=dUkI03LBF8E

  6. #6
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    RE: Easy way to determine battery polarity?

    The red wire is positive, the black wire is negative. You should really get a multimeter, its very usefull.
    Hittin\'\' easy street on mud tires

  7. #7
    Mdubz's Avatar
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    RE: Easy way to determine battery polarity?

    Not always. I had bought a custom made battery from someone a while back, and the wires were set up with wrong colors. This current battery is also a custom battery, so I want to make sure polarities are correct before I start soldering.
    .::x/{x}Vendetta{x}\\x::.
    Permax||Quark33||Li-Mn
    http://www.youtube.com/watch?v=dUkI03LBF8E

  8. #8

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    RE: Easy way to determine battery polarity?

    You're on your own for a resistor...most RC toys will have one or more, but it'll be tough to use if it's a surface mount type. If you use an LED w/o a resistor you risk cooking the LED.

    Get a multimeter! $5 from harbor freight: http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=90899

    I've used that same piece of junk for years and it works great (cept I got it back when it was yellow and $10).
    pbmax

  9. #9

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    RE: Easy way to determine battery polarity?

    Check it the same way as you checked the other one. lol.

    ORIGINAL: Mdubz

    Not always. I had bought a custom made battery from someone a while back, and the wires were set up with wrong colors. This current battery is also a custom battery, so I want to make sure polarities are correct before I start soldering.
    plug it into a motor and see if it spins the correct way or the same way as a known battery.

    ps lots of batteries are marked also.
    and airplanes were in

  10. #10
    Mdubz's Avatar
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    RE: Easy way to determine battery polarity?


    ORIGINAL: guver

    Check it the same way as you checked the other one. lol.

    ORIGINAL: Mdubz

    Not always. I had bought a custom made battery from someone a while back, and the wires were set up with wrong colors. This current battery is also a custom battery, so I want to make sure polarities are correct before I start soldering.
    Lmao, the last way I checked my battery fried my esc. I was able to test out this one by sticking the wire up a small LED flashlight. Got deans on all my connectors now, w00t! (It's almost addicting soldering deans onto your stuff. :P)
    .::x/{x}Vendetta{x}\\x::.
    Permax||Quark33||Li-Mn
    http://www.youtube.com/watch?v=dUkI03LBF8E

  11. #11

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    RE: Easy way to determine battery polarity?

    Haha, I love soldering It usually means that new RC toys have showed up via usps, or the Brown santa (soldered up a new quark today!).
    pbmax

  12. #12
    Mdubz's Avatar
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    RE: Easy way to determine battery polarity?

    Yeah, this next week is going to be killer, waiting for my Wraith 7K/Quark 33 to arrive. Along with a bunch of other stuff that I ordered months ago and hasn't showed up yet... lol
    .::x/{x}Vendetta{x}\\x::.
    Permax||Quark33||Li-Mn
    http://www.youtube.com/watch?v=dUkI03LBF8E

  13. #13

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    RE: Easy way to determine battery polarity?

    Nice [8D] I'm waiting for the rain to stop so I can go romp on my buddy's vtx mst1 with my 3s brushless mini inferno
    pbmax


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