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Battery question!

Discussion in 'Electronic Repair' started by Rono, Jan 6, 2005.

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  1. Rono

    Rono Guest

    Lithium Ion batteries that read no voltage,
    & no resistance! Can you rejuvinate them?
    If so, how! Thanks, Rono.
     
  2. Eric

    Eric Guest

    will putting them in a fridge work

    you can do this with some secondary cell but you only get 60% of the
    capacity


    Lithium Ion batteries that read no voltage,
    & no resistance! Can you rejuvinate them?
    If so, how! Thanks, Rono.
     
  3. mike

    mike Guest

    I know what I mean by "no resistance" but not clear what YOU mean by it.
    If you mean no as in zero as in short circuit, throw them out.
    If you mean no as in infinite as in open circuit, throw them out.
    If you don't mean either, you need to describe what you mean.
    Resistance is not the first thing I think about when measuring a cell.
    dV/dI has the units of resistance and is a useful parameter.

    It's been reported that the cell chemistry gets all messed up if the
    voltage drops below some certain value. Zero meets this criterion.
    It's been reported that chemical reactions during charging from zero can
    lead to fire. I've tried it unsuccessfully.
    I'd throw them out.


    You didn't ask this, but since I'm here....
    Some lithium cells have a mechanism to open the circuit if the cell
    pressure exceeds a safe value. It's been reported that you can stick
    a small screwdriver thru the hole in the positive contact and snap it
    back closed. I tried this and it actually did complete the circuit.
    But I apparently punctured the seal in the process and killed the thing
    anyway. Yes, I was wearing gloves and eye protection, so I wasn't hurt
    by the big spark I got when the screwdriver shorted the newly "repaired"
    cell.
    mike

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  4. Guest

    Heheheh..... thats interesting.

    Li-Ion cells generally aren't meant to be tampered with though. (Hint:-
    BooOoooOOOM)
    I would tend to just replace the cell, its not worth the risk.

    -A
     
  5. jiffypop

    jiffypop Guest

    I usually dispose of all batteries by chucking them in a bonfire. What? Is
    there a problem with this?
     
  6. NSM

    NSM Guest

    | I usually dispose of all batteries by chucking them in a bonfire. What?
    Is
    | there a problem with this?

    All batteries should be disposed of properly. Many retail stores (Best Buy,
    Batteries Plus, Circuit City, Home Depot, Office Depot, Radio Shack, Target,
    Wal-Mart) collect used rechargeable batteries, and other places may accept
    other battery types.

    N
     
  7. none

    none Guest

    Are the cells standalone?(or do they have a circuit card soldered on
    the top?) If you are reading off the circuit card(brain) then THAT
    might be your problem, they crap out all the time.
    Remove(desolder) the circuit card off , THEN test the batteries.
    If you get any positive results that way then you could use the cells
    by charging them in Lion charger.(BUT only a Lion charger, absolutely
    no trickle charging!)
     
  8. Harvey

    Harvey Guest

    That's the same way I get rid of used spray paint cans, lighter refill cans,
    hairsprays... etc. Most times I collect them up for a year or two then hide
    them in somebody's bonfire. It's an interesting reaction they have to say
    the least.
     
  9. NSM

    NSM Guest

    |
    |
    | > I usually dispose of all batteries by chucking them in a bonfire. What?
    | > Is
    | > there a problem with this?
    | >
    | That's the same way I get rid of used spray paint cans, lighter refill
    cans,
    | hairsprays... etc. Most times I collect them up for a year or two then
    hide
    | them in somebody's bonfire. It's an interesting reaction they have to say
    | the least.

    I prefer to save this method for unstable dynamite.

    N
     
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