Nikon D300 forgets time

Discussion in 'Nikon' started by ad607, Dec 8, 2008.

  1. ad607

    ad607 Guest

    Is there a second battery I don't know about? My Pentax *ist D has a CR2016
    in the base. Canon dSLR have a CR2016 as well. Does the D300 have a hidden
    back-up cell? A friend's D300 forgets what the time and date is, so I
    suspect a battery issue internally.
    ad607, Dec 8, 2008
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  2. ad607

    ASAAR Guest

    You're correct, it's well hidden. The internal rechargeable
    battery is either defective or it's not being properly charged.
    Your friend may need to have the D300 serviced.

    This is from page 38 of the D300's manual :
    ASAAR, Dec 8, 2008
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  3. ad607

    Colin.D Guest

    That seems to be to be somewhat of a black mark against D300 and
    possibly other Nikon cameras if they use the same system.

    Given the life of a rechargeable is about five years if you are lucky,
    and the very low drain of clock chips, other cameras' use of lithium
    button cells like the 2016 will get at least that long a life and
    probably more without the need to recharge at all.

    And the time limit of about three months before recharging or else have
    the clock reset to zero is just ludicrous in a camera of that quality.
    A lithium cell has no such limitation. I wonder if they are using a
    very large capacitor in the Farad range instead of a secondary cell for
    the clock application?

    Colin D.
    Colin.D, Dec 8, 2008
  4. ad607

    ASAAR Guest

    I agree. Sometimes resetting a device is needed, but impossible
    to accomplish when the device's CPU crashes or goes haywire. Reset
    buttons don't always trip an interrupt line. Sometimes they're
    connected to an I/O port and require a functioning CPU to see that
    the button was pressed by polling the port. Nobody would want to
    wait 3 months (or more) for the battery/supercap. to run down.

    While I'd prefer that Nikon's DSLRs used lithium button cells, I'm
    overly troubled that they don't. I've known of several portable
    phones that used NiCd batteries and that retained about 30% of the
    original capacity they had, 7 or 8 years later. If the D300's
    internal battery/cap. had only 10% of its original capacity after 10
    years, I'd still have more than a week to recharge its EN-EL3e. :)
    ASAAR, Dec 9, 2008
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