Nicad vs Nimh batteries in portable phones

Discussion in 'Electronic Repair' started by LB@notmine.com, Oct 9, 2004.

  1. Guest

    Just had to replace the batteries in a pair of Vtech phones (model
    20-2481).
    Old were nicad. New are Nimh. Differences? Best way to charge, how
    often?

    Figure some of the kind folks in here will have knowledge.

    TIA

    LB
     
    , Oct 9, 2004
    #1
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  2. << Just had to replace the batteries in a pair of Vtech phones (model
    20-2481).
    Old were nicad. New are Nimh. Differences? Best way to charge, how
    often? >>

    LB-

    I replaced NiCd with NiMH on another phone about six months ago, and it seems
    to be holding up well. The voltage of both types is nearly identical. Since
    the cross-reference indicated the new battery was correct for my phone, I have
    to assume that the built-in charger will work.

    In my phone, the NiMH battery has greater capacity. If completely run down, it
    would most likely take proportionately longer to fully charge in the old
    charger, but that charge would supply a longer operating time than the original
    NiCd battery would.

    Just use yours like you did before, and it should be fine. If it didn't run
    down before, it should be less likely to run down now.

    Fred
     
    Fred McKenzie, Oct 9, 2004
    #2
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  3. Jerry G. Guest

    Use the new batteries as normal. The new Nimh type should have less of a
    memory problem, and may last longer.

    --

    Jerry G.
    ==========================


    <> wrote in message news:...
    Just had to replace the batteries in a pair of Vtech phones (model
    20-2481).
    Old were nicad. New are Nimh. Differences? Best way to charge, how
    often?

    Figure some of the kind folks in here will have knowledge.

    TIA

    LB
     
    Jerry G., Oct 10, 2004
    #3
  4. Guest

    On Sat, 09 Oct 2004 16:33:20 GMT, wrote:

    >Just had to replace the batteries in a pair of Vtech phones (model
    >20-2481).
    >Old were nicad. New are Nimh. Differences? Best way to charge, how
    >often?
    >
    >Figure some of the kind folks in here will have knowledge.
    >
    >TIA
    >
    >LB


    Since the charging circuit is designed for NiCad, it might cause
    problems with the MiMh battery. I think the problem comes in on the
    trickle charge, after the battery has been fully charged. Generally
    the rule is, you can charge a nicad on a NiMh charger, but not the
    other way around. But hey, if it works, it works.

    Link to more than you wanted to know about rechargeable batteries.
    http://www.buchmann.ca/
     
    , Oct 10, 2004
    #4
  5. RMD Guest

    LB,

    You better hope the phone charger is designed to deal with NiMH
    batteries. You can get a charger fire with NiMH batteries on the
    trickle charge that NiCad batteries will cope with. NiMH batteries
    mustn't have a continuous residual trickle charge.

    I'd definitely not leave the phone charging overnight, when it might
    be charged excessively.

    Ross

    On Sat, 09 Oct 2004 16:33:20 GMT, wrote:

    >Just had to replace the batteries in a pair of Vtech phones (model
    >20-2481).
    >Old were nicad. New are Nimh. Differences? Best way to charge, how
    >often?
    >
    >Figure some of the kind folks in here will have knowledge.
    >
    >TIA
    >
    >LB


    (To get email address ROT 13)
     
    RMD, Oct 11, 2004
    #5
  6. gothika Guest

    On Mon, 11 Oct 2004 04:22:42 GMT, (RMD) wrote:

    >LB,
    >
    >You better hope the phone charger is designed to deal with NiMH
    >batteries. You can get a charger fire with NiMH batteries on the
    >trickle charge that NiCad batteries will cope with. NiMH batteries
    >mustn't have a continuous residual trickle charge.
    >
    >I'd definitely not leave the phone charging overnight, when it might
    >be charged excessively.
    >
    >Ross
    >

    You must be thinking about Lion batteries.
    NiMH tolerate overcharging pretty much the same as Nicads.
    A trickle charge is no more harmful to NiMH than it is to Nicads.
    I converted all my cordless phones to NiMH a couple of years ago and
    they're doing just fine.
    Even my charger(Ray-O-Vac PS3) charges BOTH Nicads and NiMH.
    Virtually ALL charging systems in cordless phones ramp the charge rate
    down as the battery tops off so the OP should be fine with NiMH.

    >On Sat, 09 Oct 2004 16:33:20 GMT, wrote:
    >
    >>Just had to replace the batteries in a pair of Vtech phones (model
    >>20-2481).
    >>Old were nicad. New are Nimh. Differences? Best way to charge, how
    >>often?
    >>
    >>Figure some of the kind folks in here will have knowledge.
    >>
    >>TIA
    >>
    >>LB

    >
    >(To get email address ROT 13)
    >
     
    gothika, Oct 11, 2004
    #6
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