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Thread: When is a AA battery considered dead?

  1. #1

    When is a AA battery considered dead?

    THis is kind electrically related, I take lots of photo-s of residential rough-ins...
    My digital camera seems to go through batteries @ a pretty good clip. I'm curious if there is anything else I can do with the AA batteries after they are no good for the camera? I think they measure under 1.3V DC or so...
    thanks

  2. #2
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    I would go with rechargables. Thats all I use in my camera, they work well and recharge many times.

    ~Matt
    I would rather beg for forgiveness then beg for permission.

  3. #3
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    Stop using the flash if you can, also do not use the LCD view screen if it has one.

  4. #4
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    Quote Originally Posted by Short.Circuit View Post
    THis is kind electrically related, I take lots of photo-s of residential rough-ins...
    My digital camera seems to go through batteries @ a pretty good clip. I'm curious if there is anything else I can do with the AA batteries after they are no good for the camera? I think they measure under 1.3V DC or so...
    thanks
    I have a Mini-MagLite with the LED bulb. Usually there's enough juice left in a "dead" AA used for high-draw applications like cameras to keep that Mini-MagLite going for a while.

  5. #5
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    Along with what the others have said:

    I believe some cameras will put a small drain on the batteries even when not in use. I started opening the battery door of mine when I'm not using it and it seemed to help them last longer.

  6. #6
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    A battery is dead when the chemicals that get used for generating electricity are all used up.

    The problem is that most all loads require a certain minimum voltage to operate, and as the chemicals get used up the battery voltage will drop. Then the battery has internal impedance, which means that the output voltage will get lower as the load current increases. On top of this, the internal impedance changes as the chemicals get used up, generally the battery impedance goes up as the battery gets used up.

    Loads like digital cameras are 'high drain' loads, simply meaning that they call for lots of current at least some of the time. If the internal resistance of the battery causes the voltage to drop below the minimum needed, then the camera claims that the battery is all used up. Since most of this drop will be caused by internal impedance, measurements of the 'open circuit' battery voltage will tell you little about the state of charge of the battery.

    For 'high drain' applications that take AA batteries, I highly recommend 'low self discharge' NiMH batteries, and have good experience with the Sanyo Eneloop brand. NiMH batteries have a lower open circuit voltage than alkaline batteries, but they also have a much lower internal impedance, so the net voltage under load is actually higher. The low self discharge is important because you might have your batteries sit for a month or two before you need them, and regular NiMH batteries (with nominally higher capacity) will have discharged without any useful output.

    -Jon

  7. #7
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    I used to take the batteries out of my maglite and use them in the pager. They'd last about a week, then they were stone dead. Part of the monday morning ritual was swapping the pager battery.

  8. #8
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    Alive ? charged maybe then run down... I use NMH or what ever it is last long. Look for a Lacross charger at Amozon with batt. cheap and good.

  9. #9
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    Short.Circuit:

    I have a Minolta. When off this camera seems to have a substantial load on the batteries.

    My use of the camera is limited and I found the use of rechargeables not satisfactory because of this off state discharge from the camera, and their own self discharge rate. Clearly badly designed electronics in the camera. It is a major nuisance to keep removing the batteries from the camera. Rechargeables tend to have a self discharge rate with no load that is much faster than a carbon zinc battery.

    When the unloaded voltage of the Energizer cells that I use drop to about 1.44 V my camera fails. These work fine in my pager and still last a long time in the pager. But the pager requirement for batteries is small and it works to a much lower voltage.

    Currently the batteries in my LED MagLite read 1.4 V unloaded. I do not know the failure point for the Maglite. It may be in the range of 1.2 V. However, when failure occurs it is abrupt. I get a momentary flash when turned on.

    .

  10. #10
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    Quote Originally Posted by Short.Circuit View Post
    THis is kind electrically related, I take lots of photo-s of residential rough-ins...
    My digital camera seems to go through batteries @ a pretty good clip. I'm curious if there is anything else I can do with the AA batteries after they are no good for the camera? I think they measure under 1.3V DC or so...
    thanks
    Well my boss gets a bigg pack we kinda do what you do lots of shots in one day but if he runs out i take his batterys out of his camera and use them because he never comes out in the field so there always good .


    I was told that nimh batts are better than lithium once they start past a certain discharge there going to die and must be charged everyday so watch which one you get its not the electronics its the batt used in it .

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