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3-Cent Button Cells — Parallax Forums

3-Cent Button Cells

Comments

  • NWCCTVNWCCTV Posts: 3,629
    edited 2012-08-16 17:30
    So I bought these thinking they were a little larger than they are. Pictures are always deceiving!!!! These are hearing aid sized. Any how, two of them light up my 3V red LED quite brightly. I am going to see how long the LED will last before it starts dimming and then goes all the way dead.

    Edit: LED dimming (very slightly) after 20 minutes.

    Edit: LED still emitting strong light after 3 hours.
  • HollyMinkowskiHollyMinkowski Posts: 1,398
    edited 2012-08-31 17:29
    I can see how these could be useful.
    Using conductive glue might work well
    with these as you could easily glue the
    wires on and then wrap a bit of electrical tape
    around the cell and stick into a project.
    Or mount with hot glue.

    I also don't see how they can sell these at
    this price.
  • doggiedocdoggiedoc Posts: 2,246
    edited 2012-09-01 04:02
    erco wrote: »
    ... it makes $6 each at Radio Shack seem kinda silly...
    Have you ever been in Radio Shack when they did NOT ask you if you needed batteries? I'm sure they have some really fat margins on batteries.

    Paul
  • ercoerco Posts: 20,260
    edited 2012-09-01 07:32
    Anyone besides me recall the Shack's "Battery of the Month" club? They were free!
  • mindrobotsmindrobots Posts: 6,506
    edited 2012-09-02 10:19
    I was a proud member of the battery of the month club for a number of my formative years!! I may have held multiple memberships at different stores for some period of time.....before they had computers to check this kind of stuff.
  • ctwardellctwardell Posts: 1,716
    edited 2012-09-02 11:23
    How many buttons cells would it take to power a conveyor to keep a jet plane from taking off?

    Maybe at just 3 cents a piece it might be possible.

    C.W.
  • ercoerco Posts: 20,260
    edited 2012-09-02 15:29
    Put 'em all in series, you'll have a 160V battery for 3 bucks.

    Briefly. :)
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