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Thread: NiMH Rechargeables

  1. #1

    Default NiMH Rechargeables

    Erm, I know this might seem like a very noobish question, but are they supposed to just drain away by themselves?

    Everytime I charge them up, and after I leave them alone for maybe a week or 2, and put them into my camera, my camera tells me to change batteries. It's not the camera's problem.. Because alkaline works fine with it, and when they're freshly charged it works fine too.

    So.. Is it a charger problem, a battery problem, or is it just normal for this to happen?

    Thanks a lot, am really confused. =D

  2. #2
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    Default Re: NiMH Rechargeables

    If you are using Sanyo 2500 then it is the battery problem. Maybe you would like to tell us what type of battery you are using.

  3. #3

    Default Re: NiMH Rechargeables

    Er, using Energizer, 2300 and 2500.

    I read somewhere that batteries discharge themselves over time? Is it this?

  4. #4
    Senior Member Cheesecake's Avatar
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    Default Re: NiMH Rechargeables

    Quote Originally Posted by night86mare View Post
    Er, using Energizer, 2300 and 2500.

    I read somewhere that batteries discharge themselves over time? Is it this?
    yes it's true.

    they wil self discharge slowly.
    ideally, charge the batteries the night before u're goin to use them.
    You'll Never Walk Alone! - i have the best job in the world!

  5. #5

    Default Re: NiMH Rechargeables

    Thanks a lot!

    Phew, thought my batteries were suddenly spoilt, but can't be all 6 right, heh.

    Ok, thanks for the clarification man! Thanks to jbma too, for the attempt at help. Much appreciated.

  6. #6
    Senior Member Cheesecake's Avatar
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    Default Re: NiMH Rechargeables

    no problem.


    cheerssssssssssssss!
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  7. #7
    Senior Member +evenstar's Avatar
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    Default Re: NiMH Rechargeables

    2 weeks is enough for them to discharge to a value unuseable for digi cams..
    eat. drink. shoot

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    Default Re: NiMH Rechargeables

    Use sanyo Ni-MH eneloop if you like to keep Ni-MH battery long before use. Its self discharge is very low, can be said like alkaline battery.

    Regards,
    Arto.

  9. #9

    Default Re: NiMH Rechargeables

    Energizer 2500mAH series is made by Sanyo and those made before 2006 were most likely the faulty batches. Current batches of Sanyo do not exhibit the fast discharge problem.

  10. #10

    Default Re: NiMH Rechargeables

    Quote Originally Posted by Artosoft View Post
    Use sanyo Ni-MH eneloop if you like to keep Ni-MH battery long before use. Its self discharge is very low, can be said like alkaline battery.

    Regards,
    Arto.
    agreed I dunno why I spend money on other brands.... Eneloop is really the best.

  11. #11
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    Default Re: NiMH Rechargeables

    Just a question, GP 1800 Ni-MH ones. Say I charged them for a flash but I did not use it. Do I have to discharge them before storing? Can I recharge them say within 1 week from the last full charge as I need them on Full?
    Also a slow charger or a fast 4hr charger?

  12. #12
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    Default Re: NiMH Rechargeables

    Quote Originally Posted by Blu-By-U View Post
    Just a question, GP 1800 Ni-MH ones. Say I charged them for a flash but I did not use it. Do I have to discharge them before storing? Can I recharge them say within 1 week from the last full charge as I need them on Full?
    Also a slow charger or a fast 4hr charger?
    Can. No need to discharge them.

    Ni-MH does have memory effect. But it is only insignificant. That's why some new charger model from Sony have refresh effect to remove memory effect.

    It is better to use slow charger than fast charger if time is on your side.

    Regards,
    Arto.

  13. #13
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    Default Re: NiMH Rechargeables

    Thank you.

    Heard some where that keeping Li-Ion batteries at 70% is better than full drain or full charge. If so, how to know they are 70%??

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    Default Re: NiMH Rechargeables

    Quote Originally Posted by Blu-By-U View Post
    Thank you.

    Heard some where that keeping Li-Ion batteries at 70% is better than full drain or full charge. If so, how to know they are 70%??
    http://en.wikipedia.org/wiki/Lithium_ion_battery

    Regards,
    Arto.

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    Default Re: NiMH Rechargeables

    Quote Originally Posted by Artosoft View Post
    Use sanyo Ni-MH eneloop if you like to keep Ni-MH battery long before use. Its self discharge is very low, can be said like alkaline battery.
    Does Sanyo Eneloop have the same characteristics of the normal NiMH when used in a flash, ie. does it take longer to recharge the flash ?

  16. #16
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    Default Re: NiMH Rechargeables

    Quote Originally Posted by arpinkor View Post
    Does Sanyo Eneloop have the same characteristics of the normal NiMH when used in a flash, ie. does it take longer to recharge the flash ?
    I haven't tried it. But Sanyo Eneloop is Ni-MH rechargeable battery and can use normal 2000mAH Ni-MH charger. So it should be the same as Ni-MH battery.

    Anyone with Eneloop to confirm?

    Regards,
    Arto.

  17. #17

    Default Re: NiMH Rechargeables

    Quote Originally Posted by arpinkor View Post
    Does Sanyo Eneloop have the same characteristics of the normal NiMH when used in a flash, ie. does it take longer to recharge the flash ?
    If I remember what I read correctly, Eneloop batteries are a bit slower than regular NiMH batteries. Well, you have to trade off something for the low self-discharge.

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    Default Re: NiMH Rechargeables

    Quote Originally Posted by fireframe View Post
    If I remember what I read correctly, Eneloop batteries are a bit slower than regular NiMH batteries. Well, you have to trade off something for the low self-discharge.
    Thanks. I was expecting a catch somewhere.

  19. #19

    Default Re: NiMH Rechargeables

    What does it mean that "Eneloop batteries are a bit slower than regular NiMH batteries"?

    Actually I find the Sanyo 2300 batteries hold the charge better than the 2500 batteries.

  20. #20

    Default Re: NiMH Rechargeables

    Quote Originally Posted by Madmax View Post
    What does it mean that "Eneloop batteries are a bit slower than regular NiMH batteries"?
    The same chemical characteristics that allow it to retain charge better also limits the discharge rate, so the flash will charge up slower. It cycles more like alkaline batteries than regular NiMH.

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