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  1. #1
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    Lithium Polymer battery for 7up troutie light

    I am upgrading my light for kitesurfing and am looking for a new battery to drive Trouties new 7 up

    Lights are arriving shortly and I am very excited about Trouties new creation.
    Basically I am after 4 cell lipo battery (14.8v). I have brought battery packs off the Battery Space in the past and would be looking for something similar to this;
    http://www.batteryspace.com/polymerl...napproved.aspx

    I am after something that is at least 6000ma-7000ma or more if the weight can be kept down under the 700g mark. I have some missions planned on a kite and the batteries do need to be reliable. I have plasti dipped my previous batteries and that has worked well. Not really happy with the Repco connectors that I am using currently so if anyone has any good suggestions for reliable waterproof connectors please let me know.


    http://www.sessionlogs.com/yakernz-s...g-at-Lyall-Bay

    cheers

    yakernz
    http://yakers.co.nz

  2. #2
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    wow - kite surfing at night?
    what about sharks?
    It is possible for rice to absorb other odors in storage. Or could be the quality of water in it was prepared. Mahatma Rice

  3. #3
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    Quote Originally Posted by oldassracer
    wow - kite surfing at night?
    what about sharks?
    You need a laser to beat sharks.
    Troutie?
    DIY LED Bike Lights:
    A few Dynamo builds and some Small battery lights

  4. #4
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    Quote Originally Posted by yakernz
    Not really happy with the Repco connectors that I am using currently so if anyone has any good suggestions for reliable waterproof connectors please let me know.


    cheers

    yakernz
    http://yakers.co.nz
    Try Molex Mini-Fit H2O http://de.mouser.com/molexminifith2O/

  5. #5
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    Quote Originally Posted by oldassracer
    wow - kite surfing at night?
    what about sharks?
    Sharks what sharks...?


    I am slightly worried about this spot that I will be heading to in Brazil
    http://news.bbc.co.uk/2/hi/americas/4111175.stm

  6. #6
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    Hi ,

    Curious about the plasti dipped lipo. Didi you put a waterproof connector on the balance plug or do those lipo's come with a power lead and a charge lead with no balancer? It is certainly hard to fin lipo's with a built in pcm.

    I always thought the sharks motivated you not to fall off, and you can always pull some air and jump over those fins

  7. #7
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    For that large sort of size you may be better off paralleling up two smaller batteries. It will be a lot easier to find somthing that way. Personaly the latest li-po I got were from hoby king how have a huge selection but I have not found how to sort it properly on there site.
    http://www.hobbyking.com/hobbyking/store/uh_index.asp

  8. #8
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    Quote Originally Posted by Toaster79
    Repco have something similar and have been down that path. The connectors are simply not robust enough if pulled.

  9. #9
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    best connectors i have used are

    http://www.deutsch.cz/connectors/dvi-automotive/dt/

    i use the 2 pin dt series. however since you need a special tool to crimp them i use another brand that can be crimped with pliers. id suggest talking to your local auto electrician as thats what these are designed for. ill check the name of the connectors im using when i get home tonight.

    they are damn expensive, but they are really really good.

  10. #10
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    Waterproof? IP67 is basically useless for full immersion seawater.

    Automotive connectors are not rated for frequent plugging and unplugging duty (hollow formed pins tend to lose tension and the plating rapidly corrodes with salt).

    I'd probably go for gold plated EC3 connectors and treat the lead assemlies as 'consumable'.

  11. #11
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    If you get stuck I can make you a pack, with full over/under charge & short circuit protection.

    looks like 400-500gm will get you 4000-5000mah (4S pack)

    I use a otto box & hardwire connection to the light via cable gland, charging lead inside otto box. I use this for underwater stuff.

    but if you wanted lighter, I could just do the pack & you just plastic dip it...

    I am across the ditch, in OZ...so I could throw it over...PM me if you get stuck & can't find one...

    enjoy

    Ktronik

  12. #12
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    I found these online anyone tried them? Looks like they are presealed as well but would still plastidip them. The balancing leds could be a pain.

    6500ma 483grams
    http://www.maxamps.com/Lipo-6500-111-Pack.htm

    10000ma 820grams
    http://www.maxamps.com/products.php?cat=24

  13. #13
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    Looking at some of the rc forums for the max amps batteries the can be completely submerged for 40 minutes without failure and do seem pretty good.

    The problem as you said will be the balancing plug that will need to be cut off and a IP67 or IP86 plug with cap fitted. Then make a lead to connect to the waterproof plug so you can still balance charge the battery

  14. #14
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    Louis for the 7UP and the Liberator you need to be looking at 14.8 volt packs

    Might be worth getting KtroniK to quote you
    He does good stuff and the otto box idea sound good I have left you a very long lead on the light .

  15. #15
    Rolling on 650b
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    Check out commonsenserc.com. I get my lipos there for my electric rc airplanes. Looks like they have the size you want, and the packs have been very reliable. Good luck!

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