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coin cell battery search

Discussion in 'Electronic Design' started by frank, May 7, 2004.

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  1. frank

    frank Guest


    I am looking for a coin cell 1.55V/1.5V battery that can source 10mA
    of steady current. I did a copernic search, but i could not seem to
    locate one.
    Are there any 10mA coin cell batteries out there?
    CAn anyone recommend any such batteries.

    Actually, I was originally searching for was a typical coin cell
    battery internal impedance. Also, for the battery voltage vs. time,
    discahrge curve. Than i discovered i could not find a battery.

    Any info would really be appreciated.
  2. Joerg

    Joerg Guest

    Hi Frank,

    That'll be a bit tough. There are reasons for low current capability.
    One is that the market is mostly low current, such as watches, memory
    backup etc. The other is liability. The mfg doesn't want it do get hot
    or explode if shorted.

    Best is to talk about it with a major manufacturer such as Duracell or

    Regards, Joerg
  3. John Fields

    John Fields Guest

    I think Panasonic's got about as broad a line as anyone, and according
    to the data sheets here:

    you may be in luck, since the huge 1000mAH CR2477 looks like it can
    sustain 10mA out for a while...

    Call Panasonic, though, to make sure it won't blow up.
  4. Rich Grise

    Rich Grise Guest

    WHat am I missing here? Shouldn't almost _any_ battery be capable
    of providing 10 mA? That's hardly any current at all.

    Confused again,
  5. Joerg

    Joerg Guest

    Hi Rich,

    Not the coin cells. There is a liability issue here (shorts etc.) and most
    applications do not call for much power. Think watches, timer backup,
    calculators, memory retention, keyless entry. All that is usually under one
    milliamp, and some is just a few microamps.

    So they are designed to be weak. Most drop down several hundred millivolts
    even with a few mA of load.

    The other issue is that these cells have so little capacity. It makes no
    sense to use them in high power applications unless it was a very
    intermittent purpose. When it comes to really short bursts a capacitor can
    handle that.

    Regards, Joerg
  6. Ian Stirling

    Ian Stirling Guest

    Also, generally speaking, things you do to increase the current capacity
    of a cell often cause increased internal leakage.
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