Re: Pentax K200d or Sony A200
JensR
wrote:
None of those numbers were done with Eneloops. Some people love them,
but I prefer the higher capacity of "normal" AAs, as I usually shoot
so much that self-discharge is not a huge problem. Plus the battery
indicator on my DS gives me plenty of advance notice.
FYI, most people report that the Eneloops, despite not having as high a capacity as other batteries, actually
do
allow you to take more shots, even when self-discharge is not an issue. The reason is that standard nimh cells start to drop in voltage pretty steadily with shot (eg, each shot uses up 0.1 volt of power, or whatever) and hit the point at which the camera can't use them any more (1.15 volts-ish?) long before you've actually used up much of their capacity. Whereas Eneloops tend to hold closer to their initial voltage through more shots, meaning power remains above 1.1 (or whatever) volts through more shots, before it starts declining rapidly.
So while if you put the batteries in a device that is capable of draining them completely, Eneloops won't last as long, but in the Pentax DSLR's that take AAs, they really do allow more shots for most people, because while they have less capacity over, they take longer to hit that magic knee in the curve where the voltage drops below the camera's threshold.
Of course, I haven't done any controlled tests to prove or disprove this, but that's the usual claim, and my experience does seem consistent with this. In particular, I would observe that since switching to Eneloops a year or so ago, I cannot ever recall ever having to change batteries in the field. Whereas it was not terribly uncommon before, if I went several days in a row with a hundred or more shots. Now that just isn't a problem.
I also use rechargeable AA batteries in:
my flash
my other cameras
my GPS logger
my travel razor
and some non-photo related stuff.
Similar story here, but in most of the other devices, the lower overall capacity of the Eneloops really
is
an issue, and they definitely don't last as long. The Eneloops I reserve for the camera itself, because as far as I can they are superior in every way, and also for my flash, because I use it seldom enough that self-discharge is a bigger issue than number of shots.