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Thread: lipo question

  1. #1
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    lipo question

    I keep seeing 3s and 2s lipos, whats the difference and how do I know which one I have?

  2. #2
    Marshal ksb51rl's Avatar
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    The difference is Voltage.
    2S = two cells in series = 7.4V nominal, 8.4V maximum.
    3S = three cells in series = 11.1V nominal, 12.6V maximum.

    Look on the label or count the balance tap wires. A 2S pack will have three small balance tap wires, a 3S pack will have four.

    Or use a voltmeter on the main power leads or balance taps. Over 8.4V = 3S.
    Last edited by ksb51rl; 04-24-2013 at 07:53 AM.
    Alt-248 on the number pad =

  3. #3
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    k thanks, thats the extra plug coming out of the battery pack, right? What exactly is that for?

  4. #4
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    It is used for equalizing the voltage between the cells. Otherwise one cell could over charge or over discharge. That ruins the pack.
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  5. #5
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    Oh ok, so thats for multi pack chargers then? I currently only have an Onyx100 and am charging them individually at the 2nd setting....is this not good?

    Also these are the lipos I have right now. The blue one has 3 wires coming out so I'm guessing that 3s? The black has 4 does that make it 4S?, is that OK for a revo or a summit?



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    Last edited by cooleocool; 04-24-2013 at 09:22 AM. Reason: merge

  6. #6
    Marshal Dadx2mj's Avatar
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    You are taking a HUGE risk using that charger to charge lipo batteries. The charger is not designed for lipos and does not have the capability to charge them properly

    I STRONGLY suggest you stop charging those lipos until you can get a lipo charger. It isnot worth the risk you are taking to continue using that charger on any lipo pack.
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  7. #7
    Traxxas Marshal cooleocool's Avatar
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    STOP charging those batteries with that charger immediately! It is NOT designed for charging Li-Po batteries!
    "Happiness depends upon ourselves." -Aristotle

  8. #8
    Marshal ksb51rl's Avatar
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    Putting it bluntly, if you know so little about LiPo battery packs, you have NO BUSINESS charging or using them UNTIL you do some homework. ATM you are risking the health and safety of yourself and others.

    Again, "A 2S pack will have three small balance tap wires, a 3S pack will have four." You have one 2S pack (top photo) and one 3S pack (bottom photo.)

    Charging LiPos with non-compatible chargers is asking for smoke, fire, injury, and death.
    Alt-248 on the number pad =

  9. #9
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    Quote Originally Posted by dsuppa View Post
    Oh ok, so thats for multi pack chargers then? I currently only have an Onyx100 and am charging them individually at the 2nd setting....is this not good?

    Also these are the lipos I have right now. The blue one has 3 wires coming out so I'm guessing that 3s? The black has 4 does that make it 4S?, is that OK for a revo or a summit?



    Sent from my Galaxy Nexus using Tapatalk 2
    no. each pack has multiple cells. those cells are connected in series on most packs. a 2s lipo has 2 individual cells wired together in series. if those individual cells in the pack are at different voltages it could cause damage. stop using that charger for lipos. it is VERY dangerous.

    here are some links to read.
    http://www.rcgroups.com/forums/showthread.php?t=209187
    http://scriptasylum.com/rc_speed/lipo.html
    https://sites.google.com/site/tjingu...po-terminology
    https://sites.google.com/site/tjingu...-chargers-work
    https://sites.google.com/site/tjingu.../lipo-problems

    i would strongly recommend you read those for your safety and understanding. your going to burn your house down if you keep using them the way you are.

    they are still fun though. dont let the risks discourage you. there are benefits. cheaper, more powerful, longer runs, longer life.
    really quit charging them with that charger.

    is it just me or do those batteries looked puffed?
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  10. #10
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    Dsuppa, please drop the lipo and step away from the charger.


    Or this will happen inside your house. http://youtu.be/ixIOEPnsgbI
    Last edited by ImageX; 04-24-2013 at 11:19 AM.

  11. #11
    RC Turnbuckle Jr.
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    Quote Originally Posted by Jimdog View Post
    ... is it just me or do those batteries looked puffed?
    No, it is not just you - the 2S pack definitely appears puffed.

  12. #12
    RC Turnbuckle Jr. mike-susieq1's Avatar
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    That's what I was waiting to see if anyone noticed those lipos puffed. They are done for no good anymore. Time for a new charger first a lipos charger then then new lipos best way to do it. If you continue to use that charger and lipos it's going to be very hazardous for you and those around you along with property.
    DEU 8:18 ESV

  13. #13
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    wow ok thanks. guy at the R/C shop sold me that charger with the batteries.
    Last edited by Dadx2mj; 04-24-2013 at 01:05 PM. Reason: Language

  14. #14
    RC Turnbuckle Jr. mike-susieq1's Avatar
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    take it back and tell them they sold you the wrong stuff and ask them to replace the lipos as well since they sold it like that to you. Best of luck.
    DEU 8:18 ESV

  15. #15
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    Wow. I cant believe how careless the hobby store you went to is. I would not do business with anyone like that. Make sure you do some research on the proper care and use of lipos. Talk with someone at a local hobby shop. Balance charge your lipos every time. Dont be discouraged. You were improperly introduced to lipos. Good luck.

  16. #16
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    Oh I'm totally going there and complaining and asking to speak to the manager. I still have the receipt and I bought a Merv 2 lipos, charger and an extra NiMH for slow rides. It was not cheap......

    Sent from my Galaxy Nexus using Tapatalk 2

  17. #17
    RC Turnbuckle Jr. Petertje60's Avatar
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    After you got either your money back or the right stuff, I suggest to never return there anymore. Scary story. Very.
    Nobody is born with experience

  18. #18
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    +1 on that.
    I wonder how many other people have been sold the wrong equipment from the shop.
    Guide books aren't part of the packaging.

  19. #19
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    went back today and spoke to the manager, apparently the person who sold me this stuff was fired last month for stealing from the store, he apologized and gave me a new battery since I only had the receipt for the 1600 pictured above and an Onyx 235 for $70.

    Charging it up now......

  20. #20
    Marshal ksb51rl's Avatar
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    Good! I hope you've been studying up on the care and feeding of LiPos.
    Alt-248 on the number pad =

  21. #21
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    Somewhat. So far I've charged the battery twice using the factory settings and didn't run in down to completely drained. Have to say I can definitely see a difference from this properly charged lipo than from my incorrectly charged one and my dual nimhs

    Sent from my Nexus 7 using Tapatalk HD

  22. #22
    Marshal ksb51rl's Avatar
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    I hope that's a Positive difference.
    Alt-248 on the number pad =

  23. #23
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    you switched the esc to lipo mode right?

  24. #24
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    yeah its a positive difference, and yes I did switch the esc to lipo mode. Thats the only thing the guy who originally sold me everything got right......

    Coming from all Nitro, electric has way more rules it seems.

  25. #25
    RC Turnbuckle Jr. Jimmie Neutron's Avatar
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    There are not a whole lot of rules... just a few very important ones. Honestly, now that I have ran this new-to-me technology for a few years I don't even have to think about the rules in order to follow them. I came from nitro too... and was out of the hobby for many years before I got back into it.
    Whatever it is I just said... I could be wrong.

  26. #26
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    You are lucky your house didn't burn down.
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  27. #27
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    The one thing nice about lipos, they get better after a break-in period.

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