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Thread: Searching for the perfect battery pack

  1. #21
    Jedi Initiate Obi-Ben's Avatar
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    Haha

    I know this is a question for the LED subforum, but since I'm here and I have your attention... Am I correct to assume that if I had a 7.4V battery pack on a P4, I would get a significantly longer run time than if I used a 4.8V battery pack?

  2. #22
    Jedi Council Member cardcollector's Avatar
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    I don't think the voltage determines the run time- its the MAh. I THINK.
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  3. #23
    Jedi Initiate Obi-Ben's Avatar
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    No, you're right. But if my setup only requires a fraction of the available voltage, I would imagine that would effect runtime also.

  4. #24
    Jedi Council Member cardcollector's Avatar
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    You're right too. more Mah+more voltage= More LIGHTSABER!!!
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  5. #25
    Council Member Novastar's Avatar
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    Jedi Lori is correct. The US board does NOT really utilize "excess" voltage... it burns it off as heat.

    The CF boards DO utilize "excess" voltage... for lack of a better way to put it + simplicity... it turns it into current.

    Cardcollector, not all Lux IIIs are "best" with ~3v. That is only mostly true of the red, red-o and amber series. The green and blue, etc. (lightside) colors are actually made of a different chemistry and require a bit more punch... ~4v.

    Additionally... "forward voltages" ***DO NOT*** mean the voltage you will need to get the maximum lumens output, nor the maximum current allowed (usually). In fact... often--it takes more! X-Wing demoed this with a Luxeon Red some time ago. Hard to explain, but... he showed that to get more current flowing... we needed >3v. Makes sense. Current and voltage are relational.

    Ok. So.

    7.2v + Lux V + US is probably ok, but it will only run the Luxeon V at "decent" specs (750mA, maybe even 900mA) for a short period of the battery pack's charge.

    Why.

    You have to figure that the board itself needs ~1v. Sure, maybe less, but... whatever. Then the speaker would be... ~1v. Maybe less. Either way, let's say it was 0.5v for each. That means:

    SPK + US Board = ~1v used
    Lux V LED = ~7v used (just to get 750mA to ~1000mA!!!)
    TOTAL = ~8v

    Now. Depending on your battery pack, a "7.2v" pack... may yield/read 8.4 "TRUE" volts, lol... that is--when not under load (i.e. not connected to a board or device sucking on it like a vampire). When it comes under load... the voltage will drop a bit. Probably to ~8v, maybe 7.8v. As time goes by, soon you are at 7.5 and somewhat less quickly to 7.3 or so.

    At this point, you get a nice long "FLAT" discharge curve if you're using Li-Ion... but I don't know about Ni-Mh. Ni-Mh would probably be a deeper curve, and the voltage would drop a bit more severely.

    ALRIGHT. ENOUGH OF ALL THAT! Hope it helps.

    Final thing though: more mAh = more runtime, yes that is usually true. But... more voltage = ????? it depends. On many things.

    Heck. More voltage sometimes = KER POW and that yield ~Zero~ runtime, hahhahah

    Ok, maybe more like Ker-Blooey. Ker-thwack? Ker-munchen. Ker-mit. Whatever.
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  6. #26

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    Quote Originally Posted by Novastar View Post
    Ok, maybe more like Ker-Blooey. Ker-thwack? Ker-munchen. Ker-mit. Whatever.

    Ker-mit?


  7. #27
    Jedi Council Member cardcollector's Avatar
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    I'm so confused....

    Oh well, I guess that I have to actually have the stuff to understand.
    I can't afford U.S. boards - hasbro is my only option.
    Would 7.2 volts with a hasbro board and Lux III be too much?
    If so- how much do I use?
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  8. #28

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    Dudes, you're going to want to listen to exactly what the Council Members say (which is probably why I've been successful with my MHS builds so far) I lurked and I read for months before I even bought my first part from the store, let alone joined the message boards.

    In the case of electronics excess heat can ruin them for sure (look at the Xbox 360 for that), but I personally haven't noticed any heat issues with my current setup. It just doesn't seem like the extra voltage when running a Lux III off of the Trustfires is causing much heat buildup in my hilt. Though as previously stated, I might just be lucky.
    Last edited by Darth Siggious; 03-19-2009 at 08:29 AM.
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  9. #29
    Jedi Initiate Obi-Ben's Avatar
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    Thank you so much Novastar for your detailed explaination. I think I get it now.
    -get only the voltage you need
    -use Li-Ion rechargeables
    I'm just hoping Tim will have the 4.8V packs in stock again soon.
    Last edited by Obi-Ben; 03-19-2009 at 08:33 AM.

  10. #30

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    Quote Originally Posted by cardcollector View Post
    I'm so confused....

    Oh well, I guess that I have to actually have the stuff to understand.
    I can't afford U.S. boards - hasbro is my only option.
    Would 7.2 volts with a hasbro board and Lux III be too much?
    If so- how much do I use?

    you can use more.. but the board might 'blow' with more than 6v usually..so you'd need to put a regulator between the them.. (so you dont fry the board)

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