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    Rongzhong Li
    2019年5月22日
    已編輯: 2019年5月22日

    Powering Nybble with Li-po Battery

    在 Hardware

    Li-po batteries are very good to supply large current. I just tested

    "Tenergy 7.4V 900mAh, 25C High Power Lipo Pack"

    on Nybble.

    It seems that with its super power, the protection in NyBoard's step down chip will always be the bottleneck. So it's a must to bypass it as discussed in previous post.


    It's also recommended to design a customized battery mount to replace the original one on the belly, to keep the center of mass low and symmetric.


    13 則留言
    13 則留言
    J
    Jakob Leander
    2020年5月25日

    I use LiPo's for most of my hobby projects and have a nice flat 2S 1000mah for my Nybble. Instead of battery compartments, what works well is just a bit of self-adhesive velcro on Nybble and battery. Easy low cost solution and you can even move battery a bit around if you want to play with center of gravity.


    按讚
    R
    Rongzhong Li
    2020年5月26日
    回覆

    it's a great idea!

    按讚

    S
    SC1
    2020年2月11日

    So from some digging I expect these AA size EBL batteries are rated for ~1.0C or about 850mA max discharge in series (based on all the similar form factor datasheets I could find). I'm guessing things work because moves are a bit "bursty" on the current.


    I was thinking I'd put of pair of Jauch 1.9Ah 3.7 with a 2C rating (e.g. Digikey 1908-1372-ND). This should then be good for 1.9A steady state (providing significantly more headroom) and essentially the same weight and physical envelope as the battery holder. Maybe instead the pack 1568-1876-ND, but it may be too wide and long. I'm only now starting to assemble so I don't have a good since of the true maximum.


    @Rongzhong Li What are your thoughts on shimming the legs out a few millimeters (and what are the real maximum dimensions?


    按讚
    R
    Rongzhong Li
    2020年2月12日
    回覆

    The EBL can supply larger current, with significant voltage drop. The capacitor on NyBoard is helping a little in buffering the power supply. The height of the servos is the obstacles for larger batteries. I’m going to live in a servo factory for several month to design some shorter servos. I’m also designing a 5C li-poly battery pack with charging circuit. I hope to provide it as an official accessory to solve all the powering issues.

    按讚

    R
    Rongzhong Li
    2019年11月07日

    When connecting batteries in serial, it’s very important to use same batteries to avoid unbalanced loads. To work with Nybble, the maximal discharging rate also matters. The battery should be able to handle >3.5A without shutting down the current. It’s ok the change the terminal plugs as long as the direction is correct.

    按讚

    J
    John Gallaugher
    2019年11月07日