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Thread: Lipo Help

  1. #31
    Join Date
    26th November 2009
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    4,357
    Duct tape and zip ties can be helpful here as is securely mounting the hardware. If the fit is tight thrust blocks and zip ties are fine if there is no room for stuff to flop around. Kurt


  2. #32
    Join Date
    3rd February 2012
    Location
    So Cal (ROC, TRASD, SCRA)
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    2,404
    Quote Originally Posted by ttabbal View Post
    I'm not a fan of the JST-RCY. It comes apart with very little force, low enough that I'd be fine using it as a break-away connection for a staged rocket.
    Most of the real JST-RCY connectors I've seen take a fair degree of force to take apart, but the Chinese clones may be the ones you're talking about. When you see them for $1.46 for 100 of them on eBay, they ain't genuine. They're junk... ill-fitting, and the pins fall out too.


  3. #33
    Join Date
    19th January 2009
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    890
    Quote Originally Posted by cerving View Post
    Most of the real JST-RCY connectors I've seen take a fair degree of force to take apart, but the Chinese clones may be the ones you're talking about. When you see them for $1.46 for 100 of them on eBay, they ain't genuine. They're junk... ill-fitting, and the pins fall out too.
    The only ones I've seen are the cheap Chinese stuff from hobbyking.com and similar. So you make a good point. I haven't had any quite that bad, but I also paid a little more than that. I should buy some nice real ones next time just to compare. Digikey maybe...

  4. #34
    Join Date
    17th June 2011
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    The fertile fields of Malta, IL
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    3,069
    Stopped by the local Hobbytown yesterday. Picked up the correct (I hope!) JST adapter to connect my batteries to my charger. So, when I get home Thursday, I'll see if I can charge them to "storage mode"...
    Then, maybe I should try assembling my Rtx base unit case.
    I'm about done building a rocket that might need GPS to find.
    Adrian Butler
    jd2cylman@mchsi (dot) com
    NAR 73787 L3
    Tripoli 13524 L3
    QCRS, Princeton, IL
    Chicago Rocket Mafia "The Mechanic"

    Buckle up back there, we're going into "Hyperactive!"

  5. #35
    Join Date
    9th December 2015
    Location
    Fullerton, CA
    Posts
    63
    Do the LiPos hold up to the stresses of a rocket launch? I just had one start leaking, smoking and hissing from some minor handling that would be far less stressful than a launch/ejection would be. Is this something to be concerned about, or did I get a bad cell?

  6. #36
    Join Date
    13th August 2014
    Posts
    752
    Must be a bad cell. We run them in combat robots that undergo far worse than anything a rocket will see. I've had some still running after many years of competition.
    -Brian Schwartz
    LiquidFyre Rocketry
    https://www.LiquidFyre-Rocketry.com
    TRA #15327 L2



    If it's worth doing, it's worth over doing!

  7. #37
    Join Date
    12th September 2013
    Location
    SE Wisconsin
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    934
    I'd like to hear more about storing Lipos. It seems like half of my Venom 2S, 200mAH-ish cells don't survive from season to season.
    Charles McGonegal
    Ciderwright at AeppelTreow Winery & Distillery
    www.appletrue.com
    NAR #103560 L1 6/25/17 Estes Leviathan CTI H175-SS
    Ad Astra Tabernamque!

  8. #38
    Join Date
    27th July 2014
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    south beloit, IL
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    Quote Originally Posted by Charles_McG View Post
    I'd like to hear more about storing Lipos. It seems like half of my Venom 2S, 200mAH-ish cells don't survive from season to season.
    it's probably the brand.. the ones I use (generic ones from sparkfun) hold their charges great, and never seem to go bad. I only had one die on me, from a flight that ended in a non-optimal interaction with the ground.
    NAR# 99285
    Tripoli# 16283
    L1- 4/26/2015 Madcow Cowabunga- H123SK
    L2- 11/1/2015 Wildman Darkstar 2.6- J355RL
    Woosh
    QCRS

  9. #39
    Join Date
    19th January 2009
    Posts
    890
    Quote Originally Posted by Charles_McG View Post
    I'd like to hear more about storing Lipos. It seems like half of my Venom 2S, 200mAH-ish cells don't survive from season to season.
    Leaving them fully charged or discharged is really hard on them. Are you using a storage charge on them? Most LiPo chargers have a mode for that.

  10. #40
    Join Date
    12th September 2013
    Location
    SE Wisconsin
    Posts
    934
    Not low, but probably close to full. I'm using the charger that comes with the big Estes RC copters. It checks the cells - but doesn't have a storage option. Looks like I may want to get a better charger.

    Charles McGonegal
    Ciderwright at AeppelTreow Winery & Distillery
    www.appletrue.com
    NAR #103560 L1 6/25/17 Estes Leviathan CTI H175-SS
    Ad Astra Tabernamque!

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