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Thread: Battery for Neopixel blade

  1. #1

    Default Battery for Neopixel blade

    Is the Panasonic 18650 10 amp battery here in the store sufficient to power a Neopixel blade? I have read a few places where people say you need a 15 amp. I would like to get some opinions. Thank you.

  2. #2

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    I believe that one will work fine. I have done all of my bench testing with a 10 amp 18650. Run time a lot less than tricree though. I'm building my Kylo Neopixel with a 26650 15 amp PC. I haven't had my strips (double adafruit skinny 140/meter) trip my battery yet with any stock color on Prizm, or lockup, so I'm assuming that is pretty good, since lockup blends all three colors in the Neopixel, and that is when the largest draw occurs.

    Tom
    Last edited by Tom Tilmon; 12-20-2017 at 09:06 AM.

    "Let the past die."

  3. #3

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    Quote Originally Posted by Tom Tilmon View Post
    I believe that one will work fine. I have done all of my bench testing with a 10 amp 18650. Run time a lot less than tricree though. I'm building my Kylo Neopixel with a 26650 20 amp PC. I haven't had my strips (double adafruit skinny 140/meter) trip my battery yet with any stock color on Prizm, or lockup, so I'm assuming that is pretty good, since lockup blends all three colors in the Neopixel, and that is when the largest draw occurs.

    Tom
    Question regarding this actually. The battery is rated at 10 amps, but jst connectors absolutely are not, at least as far as I can tell from reading about them. Will I have to pop an ec3 on that badboy? Maybe a micro Dean? Or is the jst safe?

  4. #4

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    I've been building these blades for two years using 10amp batteries. The published max current is 60ma @ 5v, for an 18650 it shouldn't be that high. You can read a nicely prepared report here which characterizes the current over the discharge range: https://github.com/Protonerd/DIYino/...on_report1.pdf

    I never checked the rating on the JSTs, which seem to be 3A. I've mostly hard wired my batteries, so I can't really say too much about that. I think a lot of people may be under sizing their wiring as well. Even if we don't expect to hit the maximum load, we should certainly design for it in order to prevent any sort of thermal event.

  5. #5

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    I am using way heavier gauge wire than I would normally use to wire an LED. I don't use JST connectors, I directly connect as well. I guess we're all about to be crash test dummies over the long run, but all the guys that have been building string Neopixel blades and strips have been running them for quite awhile now. I haven't seen many major issues (except for reduced run times) reported.

    Tom

    "Let the past die."

  6. #6

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    Thats good to know. I have some 22 AWG I planned on using. What about the Switchcraft recharge port thats available in the store? What is the max current rating on that? Would that be safe to use?

  7. #7
    Owner of the Custom Saber shop Strydur's Avatar
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    Default

    I never considered the current rating of the JST.. According to the specs with 24 gauge wire it is only rated at 2A and with 26 gauge wire 1A. A quick google search shows a lot of people have ran them at 10A or more with no problems while others warn against doing it. Obviously in the saber world customers have drawn a lot more than the ratings and I have never heard of anyone having a issue. That said, for neopixel, I would probably hard wire it.
    Tim
    The Custom Saber Shop

  8. #8

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    Quote Originally Posted by bill_fimm View Post
    Thats good to know. I have some 22 AWG I planned on using. What about the Switchcraft recharge port thats available in the store? What is the max current rating on that? Would that be safe to use?
    The most draw will be negative from blade to board.

    I don't know what the RC Port rating is, but the positive pin will take the most juice there. One of the board manufacturers was so concerned about Neopixel draw on the ground, he widened his ground within the board to carry more juice. Hard wire your battery. I'll look into the rating on the Switchcraft RC Port, but many of the guys that have been doing these have been running fine off the normal stuff.

    Tom

    "Let the past die."

  9. #9

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    Quote Originally Posted by Tom Tilmon View Post
    The most draw will be negative from blade to board.

    I don't know what the RC Port rating is, but the positive pin will take the most juice there. One of the board manufacturers was so concerned about Neopixel draw on the ground, he widened his ground within the board to carry more juice. Hard wire your battery. I'll look into the rating on the Switchcraft RC Port, but many of the guys that have been doing these have been running fine off the normal stuff.

    Tom
    Hard wired meaning through the recharge port as in the Plecter manual? Thank you for your reply. I am new to this hobby and just want to make sure I am doing this safe.

  10. #10

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    Yes. Though RC Port. Here is the rating on their dc charging ports:



    5amps rated. If one of the tabs on RC port were to give way and melt (which I doubt), I'd rather a failure occur there. The boards are also carrying the load. The internal traces on the board are much thinner than the legs on the port. I believe that industry, for their safety must underestimate rating, and over-estimate draw of components. That and the neopixels strips ideally run at higher voltage than most of us are actually using in them. We are using lower voltage.

    I still think the biggest issue/change with neopixels will be the MAH. They will eat a lot of juice quicker than in-hilt LEDs. IMO that will be the big change.

    Tom

    "Let the past die."

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