I agree with your need to keep the camera on, but I think you are
killing your batteries.  If weight isn't an issue, apply some technology
to the problem.  Rig up a harness and wire a set of batteries in
parallel to keep the load down on each.  It will really help the
lifetime of them.  With my 300D and an IS lens I still get 400-500 shots
out of a battery.  You may be happy with only 50 shots, but I think you
could easily be much happier and without the high load on your batteries.

If weight really isn't an issue, go with gel cells in series and a
regulator.  We used to use a similiar trick on our ELPers (an
interferometer for locating crashed airplanes) using a pair of 9V
batteries and a voltage regulator IC to push the 18V back down to 3V.  A
9V battery has to be seriously dead before its voltage falls below 1.5V,
so those battery packs were practically immortal no matter what
conditions we used them in (planes have a terrible habit of crashing in
deep snow in the dead of winter and never on warm sunny days).

On Mon, Aug 30, 2004 at 09:38:05AM +0900, James B.Davis wrote:
>Fact is, shooting birds or any wildlife, you have to have the camera
>ready. If I'm in a location and ready to shoot, my camera is on and
>ready. If I'm ready to move on, and the camera goes back into the bag,
>it is turned off. I used to have the camera set  for auto off to
>always on and used the switch. But lately I've found the auto off does
>have it's uses for those times when you're shooting something and you
>can turn it on and get ready.


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