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Thread: Battery Questions

  1. #1

    Default Battery Questions

    Hi, I just bought a 430 ex flash with two packs of 4 AA sanyo (2500) batteries.

    When I use the flash, How do I know when the batteries are dying and I should change them?

    I own a 20D with only one battery. Usually, before an important event, I put my battery to charge, even if its not fully discharged. I know is not healthy for the battery so is there a way to get around that or the canon charger will discharge the battery for me b4 charging???


    Thanks in advance for the help

  2. #2
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    Default Re: Battery Questions

    Quote Originally Posted by tdubs
    Hi, I just bought a 430 ex flash with two packs of 4 AA sanyo (2500) batteries.

    When I use the flash, How do I know when the batteries are dying and I should change them?

    I own a 20D with only one battery. Usually, before an important event, I put my battery to charge, even if its not fully discharged. I know is not healthy for the battery so is there a way to get around that or the canon charger will discharge the battery for me b4 charging???


    Thanks in advance for the help
    not sure if this apply to all flash, but when the battery is getting weak, you will feel that the recharge time becomes longer which also means its time to change a new set of battery
    as far as i know nowaday camera battery which uses Lithium ion (include 20D batt) doesn't have to be fully discharge before charging
    Last edited by ExplorerZ; 12th August 2006 at 12:39 AM.

  3. #3
    Moderator Clown's Avatar
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    Default Re: Battery Questions

    i dunno about canon's flashes but on nikon flashes, the zoom motor inside the head will go crazy to "alert" you that the battery is almost dead.
    sigh.

  4. #4
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    Default Re: Battery Questions

    the flash sometimes 'die' off (the power led becomes no light) suddenly and you will find your pictures getting underexposed, that means your battery is either overheated/used or cant keep up with the refreshing rate.

  5. #5

    Default Re: Battery Questions

    icic thanks thanks

  6. #6
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    Default Re: Battery Questions

    The experts may correct me if I'm wrong, but my understanding is that only Ni-Cd batts need to be fully discharged before re-charge to counter the "memory effect". It is not necessary for Ni-MH or Li-Ion.

    And as for flashes, the moment you find that your recharge cycle is slowing down, change batt immediately, especially if you're shooting an important time-crucial event. While alkaline batts gradually fade out, Ni-MH run out of juice very suddenly. Will be very awkward if your batt dies just as you're about to snap a pic of something v impt.

    Hope this helps.
    Sony Alpha system user. www.pbase.com/synapseman

  7. #7

    Default Re: Battery Questions

    Quote Originally Posted by synapseman
    The experts may correct me if I'm wrong, but my understanding is that only Ni-Cd batts need to be fully discharged before re-charge to counter the "memory effect". It is not necessary for Ni-MH or Li-Ion.
    Actually, NiMH batteries have memory effects as well, just not as bad as NiCd batteries. Li-ion batteries are the best in this regard.

    NiMH batteries have a severe self-discharge problem as well.

  8. #8
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    Default Re: Battery Questions

    Quote Originally Posted by thw
    Actually, NiMH batteries have memory effects as well, just not as bad as NiCd batteries. Li-ion batteries are the best in this regard.

    NiMH batteries have a severe self-discharge problem as well.
    Agree, unless you are using Sanyo eneloop NiMH.

    Regards,
    Arto.

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