Source for very very thin batteries

Discussion in 'The Projects Forum' started by Steve C, Nov 22, 2009.

  1. Steve C

    Thread Starter Active Member

    Nov 29, 2008
    86
    0
    Hi Everyone,

    I'm looking for ideas on how to power a circuit I want to put into my wallet. The trick is that I want to keep the wallet as thin, thin, thin as possible. The circuit runs (typically) off a single 3v coin battery.

    Standard coin batteries would be just fine to use. Appealing for cost reasons too. But they require an interface. some way to connect them to a couple wires. if a couple batteries could be stacked side by side to increase circuit lifetime, that would be even better.

    All the coin battery holders ive seen are pretty thick. designed for PCB mounting. Far too thick to fit into a credit card slot. There must be other options out there too.

    rechargeable would be GREAT too, but I don't mind changing batteries. If it came down to a half millimeter of thickness versus rechargability, I'd take the thinner solution.

    What's out there?
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,772
    2,540
    As to connecting to coin cells, that should be easy. Any thin clip, such as a money clip, with connections will do it. There are also clothes line clips, alligator clips, you get the idea. You will need insulators, but carpet tape is extremely strong, and is fiber glass based, so it should work.

    For high capacitor cells, there are always cell phone batteries.
     
  3. Wendy

    Moderator

    Mar 24, 2008
    20,772
    2,540
    Another thought, it doesn't have to be coins, but thin strips of metal with wires attached all tightly taped together.
     
  4. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    5,699
    909
    Check out musical birthday cards and hack that battery holder.

    John
     
  5. k7elp60

    Senior Member

    Nov 4, 2008
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  6. SgtWookie

    Expert

    Jul 17, 2007
    22,183
    1,728
    Yep, get the coin cells with the spot-welded tabs.
    Don't try to solder wires/tabs on to coin cells - they WILL explode! :eek:
     
  7. someonesdad

    Senior Member

    Jul 7, 2009
    1,585
    141
    You might want to contact the technical representatives of some battery companies, for two reasons. One, they'll know if there are some specialty batteries that are available that the hoi polloi may not be familiar with.

    Two, it's possible that you may be misapplying a coin cell, considering that there may be mechanical pressure and stresses on it different than when it is held in a holder. You don't want to be like those kids in the 60's who walked around with Zippo lighters in their pockets because they thought they were cool. When they were filled with naphtha, the vapors would leave a nice, annoying red rash on your skin. I can imagine that the chemicals in a coin cell might be worse to have in skin proximity...
     
  8. Externet

    AAC Fanatic!

    Nov 29, 2005
    780
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    Last edited: Nov 22, 2009
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