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Store old Lithium ion batteries in refrigerator?

Discussion in 'Electronic Basics' started by Bill Bowden, Jul 6, 2006.

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  1. Bill Bowden

    Bill Bowden Guest

    Is this a good idea? How low a temperature can they take?

    I have a few spare used cell phone Li-ion batteries that I may want to
    use for other applications, and I was reading some web info indicationg
    they should be stored at 40% charge inside a refrigerator. I'm
    considering putting them in a plastic grocery bag to keep out the
    moisture. I haven't checked the capacity, but one or 2 seem to go dead
    fairly fast, so I think the capacity is already reduced. I might run a
    test on one or 2 of them.

    What shelf life can I expect from old worn out li-Ion cell phone
    batteries stored in the fridge?

    -Bill
     
  2. Simoc

    Simoc Guest

    I dunno, but regular refrigerator temp won't be too cold, at least.
    That's true.
    Dunno, but btw, I've heard that some "dead" li-ion batts can be
    rejuvenated by putting them to freezer for one night... but i've just
    "heard" that and I dunno if it's true, so I don't recommend putting
    working ones to freezer :)
     
  3. Dan_Musicant

    Dan_Musicant Guest

    On 7 Jul 2006 12:40:04 -0700, "Simoc" <>
    wrote:

    :Bill Bowden wrote:
    :> Is this a good idea?
    :
    :Yes.
    :
    :> How low a temperature can they take?
    :
    :I dunno, but regular refrigerator temp won't be too cold, at least.

    Right.
    :
    :> I have a few spare used cell phone Li-ion batteries that I may want to
    :> use for other applications, and I was reading some web info indicationg
    :> they should be stored at 40% charge inside a refrigerator.
    :
    :That's true.

    Agreed.
    :
    :> I'm
    :> considering putting them in a plastic grocery bag to keep out the
    :> moisture. I haven't checked the capacity, but one or 2 seem to go dead
    :> fairly fast, so I think the capacity is already reduced. I might run a
    :> test on one or 2 of them.
    :>
    :> What shelf life can I expect from old worn out li-Ion cell phone
    :> batteries stored in the fridge?
    :
    :Dunno, but btw, I've heard that some "dead" li-ion batts can be
    :rejuvenated by putting them to freezer for one night... but i've just
    :"heard" that and I dunno if it's true, so I don't recommend putting
    :working ones to freezer :)

    I keep my li-on rechargables stored in the refrigerator at 40% charge.
    They are for my video camera, which I use infrequently.

    Some tips:

    Try not to charge them to full capacity. At full capacity, they degrade
    a lot quicker. I charge mine to around 95% capacity or lower, when
    possible.

    Unrefrigerated, you can't expect them to last more than a year or two.
    I'm hoping to get an extra year or two use out of them. My cell phone
    battery, I don't refrigerate. It stays on the phone, but I try not to
    charge it to capacity. It's getting close to 2 years old and still seems
    OK.

    Research here: sci.chem.electrochem.battery

    I've seen various threads there that discuss these topics. Do a Google
    Groups search.

    Dan
     
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