Top off lithium ion batteries? (nikon cp4500)

Discussion in 'Digital Photography' started by dakota, Sep 25, 2003.

  1. dakota

    dakota Guest

    I have a Nikon CP4500 and about 4 or 5 extra Li-Ion batteries to go
    with it (it has an insatiable appetite for batteries). All of my
    batteries have had numerous complete cycles of charge and discharge.
    When not in use, I store the batteries "fully charged" until needed.

    In a few weeks, I'll be on a hiking trip and will not have access to
    electricity for three days, so I want to make sure my batteries are
    charged fully. I'm tempted to put the backup batteries on the charger
    to "top them off" just before the trip, since these things apparently
    lose charge internally when not in use (several of them haven't been
    used for a couple weeks). Is it a bad idea to "top-off" a fully (or
    almost-fully?) charged Li-Ion? Or should I somehow discharge them all
    and re-charge a few days before my trip? Any advice is appreciated.

    dakota, Sep 25, 2003
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  2. dakota

    Cooter Guest

    The user's guide for my battery / charger (same as yours) cautions that a
    fully charged battery should NOT be recharged. I haven't seen numbers, but
    have read on several occasions that a lithium battery has a slower charge
    loss rate than either NiMH or NiCad batteries. If you are really concerned
    about going with fully charged batteries you might put the camera in
    playback mode for, say, an hour on each battery, then recharge it. You might
    have to reset the auto-off so the display stays on.
    Cooter, Sep 25, 2003
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  3. dakota

    Paul Cordes Guest

    1. They will have lost very little charge in just a week or two.
    2. It won't hurt to charge them briefly just to top them off. But don't
    charge them overnight. This is inspite of what the other poster has read.
    It *is* bad to constantly trickle charge Li-ion batteries. But 30min to an
    hour each won't hurt them. They have no memory effect.
    3. Don't bother to discharge them and recharge them. You're more likely to
    damage them than anything.

    Paul Cordes, Sep 26, 2003
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