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  1. #1
    Join Date
    Nov 2006
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    6

    Can any NiMH AA battery go into any charger?

    Hey everyone.

    Can i safely put AA NiMH batteries that were bought with an 8 hr charger into a 1 hr charger?
    I have a Uniross 1 hr charger but i'd like new batteries with more mAhr in them. Can i just buy the batteries i'd like (not necessarily from the same manufacturer) and charge them with the charger i have?

    Thanks...

  2. #2
    Join Date
    Jul 2004
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    4,173
    Yes, the batteries don't know anything about the chargers. They'll all be fine.

    -dave-

  3. #3
    Join Date
    Jul 2004
    Location
    Formerly South Wales. Now South Carolina.
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    With NiMh you really need a reconditioning charger or you'll get a couple of dozen charges from a set before you need to toss them.

  4. #4
    Join Date
    Jul 2004
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    If the charger is designed for NiMH (I assume your 1 hour charger is) shouldn't it be OK?

  5. #5
    Join Date
    Apr 2006
    Location
    Exeter, UK
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    883
    You don't need a reconditioning charger - just ensure that they're fully discharged by leaving the camera on until it turns itself off every half dozen or so charge cycles. Some cameras, such as the Fuji S9500 / S9000 have a discharge mode in the menu.

    Any charger designed for NiMH batteries should charge any NiMH batteries, but don't mix them with old NiCd chargers / batteries. Fast chargers (1 hr or less) are likely to cook the batteries slightly, so you'll probably get fewer charger cycles from the batteries if you use them all the time. Use a slow (8 hr) charger when you've got the time.

  6. #6
    Join Date
    Jul 2004
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    4,173
    Quote Originally Posted by AlexMonro View Post
    Any charger designed for NiMH batteries should charge any NiMH batteries
    I guess my question is "Are all chargers designed for NiMH batteries reconditioning chargers?"

    -dave-

  7. #7
    Join Date
    Nov 2006
    Posts
    6

    AlexMonro, Thanks for the tip...

    Of charging at a slower charger to save battery life.

  8. #8
    Join Date
    Mar 2006
    Location
    City of Lights, City of Casinos, City of Sin -- Must be Las Vegas!
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    1,512
    Quote Originally Posted by A_C View Post
    Hey everyone.

    Can i safely put AA NiMH batteries that were bought with an 8 hr charger into a 1 hr charger?
    I have a Uniross 1 hr charger but i'd like new batteries with more mAhr in them. Can i just buy the batteries i'd like (not necessarily from the same manufacturer) and charge them with the charger i have?

    Thanks...
    Think of the larger mAH numbers like an automobile with a larger fuel tank--it should just get longer run time. The volts should be the same. Myself, I prefer to charge "sets" of the same brand batteries. Anyone here "match" batteries? That charge will only last as long as the weakest battery.

    That one hour charger probably just charges at higher amps though batteries tend to have a longer life if slow charged. However, make sure that the 1 hour charger is actually for NiMH batteries and not NiCDs (doubtfully LiIons/LiPos/LeadGell). If the batteries get hot, quit charging them.

    Something I posted on one of the other threads in response to another post:

    Quote Originally Posted by TNB View Post
    Actually, you are NOT supposed to fully discharge LiPo (lithium-polymer cells not to be confused with lithium-ion) batteries which are NOT cheap. Some LiPo batteries also have an automatic cutoff (they are not supposed to be discharged beyond a certain point or charged beyond a certain point). In addition, LiPos should be charged at least once a year to prevent over discharge and should be stored at 30-50% capacity. Myself, I also use a thermal cutoff when charging LiPo cells--usually 11.1v 3-cell packs (LiPos have a higher cell voltage rating than the typical rechargeable battery).

    NiCD (nickel-cadmium) cells are basically "memory" type batteries and should be discharged and/or recycled in order to obtain a full charge. If not, they will only charge from the developed memory, which means the typical charger may think the battery is fully charged yet it is not.

    NiMH (nickel-metal hydride) cells on the other hand don't really have a memory, so those batteries don't necessarily need to be deep cycled. However, if the batteries haven't been charged for some time, it may be necessary to recycle them or "condition" them for them to achieve a full charge. These batteries should also be charged soon before use and not be "hot" when charging.

    Myself, I own several chargers including a Triton computerized peak battery charger, discharger and cycler that charges: LiIons, LiPos, NiCd, NiMH, and Pb batteries. It also requires a separate power supply. However, I have yet to try and charge LiIons with it though the basic charge set up is the same as it is for LiPos.

    The "length" of the charge also depends on the mAH rating--Thinking like an automobile fuel tank, the larger the number the more storage space. I don't know about anyone else, but the AAs I purchased at the camera store (for my Speedlight) where 2400mAH when I had already been using GP 2500mAHs for quite sometime. Of course, the hotter the charge, the less life of the battery.
    Last edited by TNB; 11-20-2006 at 10:16 PM.
    Canon G10 - Nikon D3 - Sony P&S - Flickr Account - Non-updated Website

  9. #9
    Join Date
    Nov 2006
    Posts
    6

    Thanks TNB

    You'r right about the faster chargers charging with higher Amps, but i think it's also with higher Voltage as well. On the sticker on the back of my 1 Hr charger the output of the charger is said to be: DC 6V 1000 mA.
    I also have a slow, 8 hr charger and its output is: DC 2.8V 130 mA.
    So i guess both are important.

    Of course, i want a larger mAH batteries to "enlarge my fuel tank", i just didn't want to buy another charger.

    Thanks again.

  10. #10
    Join Date
    Oct 2006
    Posts
    3
    Quote Originally Posted by David Metsky View Post
    I guess my question is "Are all chargers designed for NiMH batteries reconditioning chargers?"

    -dave-
    Not all chargers for NiMH batteries are conditioning chargers. My charger has a conditioning cycle. I have options for milli amp charge rates and usually select a 200 ma/hr charge rate. For a 2400 ma AA battery a reconditioning charge takes 48 or more hours as it charges and discharges several times testing each battery to determine that it has reached full capacity.

    By the way the charger will also provide the ma capacity of the battery after charging. This is useful for separating out severly undercapacity batteries, although with the dozen or so well recognized name brand NiMH batteries that I purchased none were less than 10% of rated capacity when new. However subjecting batteries to high charge rates will reduce the batteries life and the capacity will decrease.

    By the way earlier this year I purchased 24 NiMH batteries for $24. A few were dead and could not be charged. Probably a third were more than 20% below there rated capacity. The company sent me 40 additional batteries at no charge so I ended up with 64 batteries. The 40 batteries had about the same problems as the origianal 24. But I can't complain.

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