will putting them in a fridge work

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


"Rono" wrote in message
...
Lithium Ion batteries that read no voltage,
& no resistance! Can you rejuvinate them?
If so, how! Thanks, Rono.

Eric wrote:
will putting them in a fridge work

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


"Rono" wrote in message
...
Lithium Ion batteries that read no voltage,
& no resistance! Can you rejuvinate them?
If so, how! Thanks, Rono.





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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FS 500MHz Tek DSOscilloscope TDS540 Make Offer
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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

"Rono" wrote in message
...
Lithium Ion batteries that read no voltage,
& no resistance! Can you rejuvinate them?
If so, how! Thanks, Rono.


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

"jiffypop" wrote in message
. ..

| 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

On Thu, 06 Jan 2005 03:34:02 -0800, mike wrote:

Eric wrote:
will putting them in a fridge work

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


"Rono" wrote in message
...
Lithium Ion batteries that read no voltage,
& no resistance! Can you rejuvinate them?
If so, how! Thanks, Rono.





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.
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!)

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

"jiffypop" wrote in message
. ..

"Rono" wrote in message
...
Lithium Ion batteries that read no voltage,
& no resistance! Can you rejuvinate them?
If so, how! Thanks, Rono.


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.

"Harvey" wrote in message
...
|
| "jiffypop" wrote in message
| . ..

| 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