Looking for battery suggestion on Pentax K100D

Discussion in 'Pentax' started by Bret Cohen, Sep 1, 2006.

  1. Bret Cohen

    Bret Cohen Guest

    Hi all:

    What is the best battery recommendation for the Pentax K100D DSLR?

    I've been told to NOT get the RECHARGEABLE CRV3's as that they may cause
    damage.

    Feedback, suggestions.
    Comments on choice of camera?

    Thanks

    Bret
     
    Bret Cohen, Sep 1, 2006
    #1
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  2. Bret Cohen

    Paul Mitchum Guest

    I end up near an Ikea on my day-to-day, and they have AA batteries for
    an incredibly cheap price. I get a handful of those packets to keep
    around for when other batteries start to fail.

    I get the CRV3s because I have an *ist DS, and the DS has trouble
    figuring out whether AAs are dead or not when they're low, requiring an
    on-off-on power cycle. Very annoying. This might have changed in the
    K1x0D line.

    How and why would rechargeable CRV3s damage a camera?
     
    Paul Mitchum, Sep 1, 2006
    #2
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  3. Bret Cohen

    Bret Cohen Guest

    According to Pentax, there is the possibility that when the power drops, it
    can damage the electronics.
     
    Bret Cohen, Sep 1, 2006
    #3
  4. Bret Cohen

    John Francis Guest

    That's incorrect. It's nothing to do with the power level.
    (Well, except the battery does need to be charged, or course.)
    Some of the early rechargeable CRV3s are not voltage regulated,
    and so can deliver a higher voltage than the camera can handle.
    Apparently later models of the rechargeable CRV3s don't have
    this problem, but unless you're absolutely certain it's best
    not to risk frying your camera.

    I use rechargeable NiMH cells in mine, but it's a lot easier
    just to use regular CRV3s (or Lithium AAs) if you have a cheap
    source; they have a shelf life of around ten years, are quite
    lightweight, and last for large numbers of exposures.
    According to some of my friends who use them the auto-focus
    speed of the camera is improved by using Lithium cells.
     
    John Francis, Sep 1, 2006
    #4
  5. Bret Cohen

    Pete D Guest

    The testing I did with my DS did not show any difference in AF, I was hoping
    that it would be faster. I have five or so sets of NiMh that I keep in sets,
    they last for around 400 shots, I also have a set of CR-V3's in the bag but
    have never had to use them. The 2500mh NiMh's are cheap and with a fast
    charger that does each cell individually I have never had a problem.

    Like the look of the K100D but am waiting for the K10D to come out before I
    will buy again.
     
    Pete D, Sep 2, 2006
    #5
  6. Bret Cohen

    GlynM Guest

    Its a voltage thing. A recently charged Li-on rechargeable CRV3 has a
    on-load voltage of around 4.2 volts. Some manufactures reduce this with a
    diode taking the voltage down to around 3.4v. A pair of these would be at
    6.8v which I believe is right on the limit for a Pentax DSLR. In use the
    voltage quickly drops and the dioded rechargeable CRV3s spend most of the
    time at about 3V but its the initial voltage that can cause the damage.

    Glyn
     
    GlynM, Sep 3, 2006
    #6
  7. Bret Cohen

    Bret Cohen Guest

    Thanks for all of the info.

    BTW

    Do they make lithium Ion AA batteries or just stick with the NiMH
     
    Bret Cohen, Sep 4, 2006
    #7
  8. Bret Cohen

    Paul Mitchum Guest

    Thanks for the clarification.
     
    Paul Mitchum, Sep 4, 2006
    #8
  9. No Li-ion that I've heard of. It could be worth considering the new
    Sanyo "eneloop" batteries, which are still NiMH but have MUCH less
    self-discharge. The jury is still out on how well they work in
    practice - you give up some capacity in exchange for that lower
    self-discharge.

    A set of NiMH's can in theory give you several hundred shots per charge,
    but you can be disappointed if you expect that to last you several
    weeks, because of self-discharge with standard NiMH's. I make it a
    point to recharge once a week whether I've shot much that week or not,
    and also charge at the end of any day where I've shot more than, say,
    50-100 images. I carry the CRV3's that came with the camera as backup
    should my rechargeables give out during a day of shoot. I've only had
    to resort to them maybe 3-4 times in over a year (during which I've shot
    around 10,000 images), so they should still have hundreds of shots left
    in them.

    ---------------
    Marc Sabatella


    Music, art, & educational materials
    Featuring "A Jazz Improvisation Primer"
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    Marc Sabatella, Sep 4, 2006
    #9
  10. Bret Cohen

    John Francis Guest


    That's pretty much my strategy - I'll recharge before a day of shooting
    unless the batteries are recently charged. I have a *ist-D with the
    battery grip, and I've yet to exhaust a fully-charged set of 8 2500mAh
    cells in a single day of shooting, so carrying the original CRV3s as
    well as an 8 additional NiMH cells is more than I anticipate needing.
    One thing I have noticed, though, is that the (Energiser) 2500mAh cells
    don't hold their charge as long as my previous (RayOVac) 1800mAh batteries.
    With the RayOVacs I could pick up the camera and use it after it had sat
    around on the shelf for a month. I can't do that with the Energisers.
     
    John Francis, Sep 4, 2006
    #10
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