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Question about re-wraped battery

Discussion in 'Batteries and Chargers' started by Andromendous, Sep 11, 2016.

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  1. Andromendous

    Andromendous Super Member ECF Veteran

    Jul 12, 2014
    Oklahoma, USA
    Hey all, I was re-wraping one of my Samsung 30q's and I lost the little white insulator "donut" that goes around the positive post, out if frustration I went ahead and finished the job. I got it to cover where that insulator would be, do you think its still ok to use? Or is that insulator absolutely needed?
    As you can see, theres no white insulator around the positive terminal
  2. zoiDman

    zoiDman My -0^10 = Nothing at All* ECF Veteran

    Supporting member
    Apr 16, 2010
    • Like Like x 4
  3. Zack42

    Zack42 Full Member

    Sep 10, 2016
    I agree just get new batteries spend couple of dollars and buy yourself a peace of mind.

    And to answer your question, it is important. Manufacturers will do anything to save money, so if that part wasn't important they wouldn't have put it there. I wouldn't mess with the batteries, the risk is too high for the cost of a new one.
  4. Completely Average

    Completely Average Vaping Master ECF Veteran

    Jan 21, 2014
    Suburbs of Dallas
    The reason the insulator is important is because the center post is positive, but the entire outer casing is negative, all the way to the top of the battery. If by some weird chance you got a small piece of conductive anything under the edge of the wrap it could create a runaway short circuit and overload the battery.
    • Like Like x 3
  5. Ed_C

    Ed_C Ultra Member ECF Veteran

    Oct 11, 2013
    Seligman, MO
    I almost lost one of those pesky things myself when I re-wrapped some batteries the other day. Those things like to run away. ;)
  6. Andromendous

    Andromendous Super Member ECF Veteran

    Jul 12, 2014
    Oklahoma, USA
    Thanks for the responses everyone. I'll just put it away for now. I was using a hair dryer to heat it up, and the darn thing blew away. What a shame.
    • Like Like x 2
  7. K_Tech

    K_Tech Slightly mad but harmless Verified Member ECF Veteran

    Supporting member
    Sep 11, 2013
    Eastern Ohio, USA
    Do you drink milk? I ask because the plastic that milk jugs are made from makes an excellent insulator in a pinch. Just cut yourself a little circle of plastic and replace it.

    And if you don't want to make one:

    18650 Positive Terminal Insulator - 6 Pack
    • Like Like x 2
  8. retired1

    retired1 Administrator Admin Verified Member ECF Veteran

    Supporting member
    Apr 5, 2013
    Moved to Batteries and Chargers
  9. Mooch

    Mooch Electron Wrangler Verified Member ECF Veteran

    Supporting member
    May 13, 2015
    That insulator ring is critical! If the wrap is pulled back even a little bit the ring is the only thing preventing a short circuit.

    You can use almost any plastic or card stock as a replacement, even a old birthday card, and cut out a new ring. Double the thickness if necessary.
    • Like Like x 3
  10. DaveP

    DaveP PV Master & Musician ECF Veteran

    Supporting member
    May 22, 2010
    Central GA
    ^^^^ This ^^^^

    Wraps are very likely to crack or tear in that spot because it's the end of the battery that people pull first coming off a charger. They catch on the charger contact and the wrap cracks. The only way to prevent the positive end from cracking is to hold and pull toward the negative end when inserting and removing them from the charger.

    Manufacturers need to use taller spring loaded negative contacts so that we can pull back the contact to lift the battery without breaking the wrap. They could put a rubber tip on it to insulate the part we touch. That might interfere with chargers that need clearance for 26650 cells. They could slant the top part, though.
    • Like Like x 2
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