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Thread: Team Death - New Heavyweight

  1. #81
    Samy's Avatar
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    Samy
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    Very nice Build Thread and cool Project!

  2. #82
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    Colin Scott
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    Christmas- its time to hang up your stocking and disharge your Lipo's.
    It's advised that Lipo and some other batteries are discharged if not in
    use for a while. so with the winter holiday period approaching I chatted
    to Adam about doing this.
    I suggested we could run our batteries flat on one of our motors so we
    tried this method-the battery easily run the unloaded motor for 8 minutes
    and there was only a 0.3 drop in voltage after this so we connected the
    turnigy charger and set it to discharge-this method was very slow but it
    let us free to do other tasks.
    We worked on the castor suspension first by cutting two angle brackets
    to support the castor hinge at a higher level, I estimate 70% of the weight
    of our Robot is at the front and the castors should make the front more
    balanced and responsive to steering.
    After welding the castors to thier base plates we looked to the scoop.
    Originaly the return springs were set inside the scoop jaws but proved
    unreliable and kept breaking so now the springs will be external and run along
    the back -this will make them more vunerable to axes but it will be real bad luck
    if we manged to lose all return capability.
    Each modification comes with a consequence it seems, so the external springs
    will lift the jaws off the Arena floor so we have made a beefy spike at the front
    of the jaws as first inpact zone-to lift the enemy bot into the scoop-In Theory.
    We are hoping to sand down the bodywork in our next session and give it
    a lovely two tone paint job.
    Here's some pitures
    DSCN1977.jpgDSCN1982.jpgDSCN1985.jpgDSCN1986.jpgDSCN1993 (2).JPGDSCN1994.jpg

  3. #83
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    Cosmin
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    The O'Neill (BW), X-301 (BW, in progress), Bald Unicorn (FW)
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    Careful there, for storage you're supposed to discharge LiPos down to around 40% capacity, not fully. Most chargers have a storage mode which gets the batteries to around 3.8V per cell for that.

  4. #84
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    Colin Scott
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    Thank's for the heads up Cosmin-our intention was not to fully discharge the
    batteries and Adam mentioned a similar % rate as yourself but for Lipo battery
    novices like myself that storage mode is usefull info-I have only ever used gell
    type batteries in the past which were heavy and quite short lived in a battle,
    while comparing the two I was Amazed at the power of Lipos compared to Gells.

  5. #85
    Redirect Left's Avatar
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    I was always taught to bring them down to around 25%, and definitely not over 60% when expected to be unused for more than 1-3 weeks.
    I've never experienced LiPos degrading (capacity/ max voltage wise) when brought down to 25% for storage, but perhaps 40% also offers the same sort of protection, and a little quicker to bring them back to life too if they don't need to charge so much when brought back into use.

    When I joined to help, I was quite eager to introduce Colin to the LiPos, as he has been out of the robot combat scene for most of the LiPo introduction and rise phase, I managed to impress even myself with the weight difference, as i'd never really used or even held the old style batteries before, so didn't realise how large and heavy they were in person.
    Last edited by Redirect Left; 6th December 2017 at 22:47.

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