What do you mean by 8000mAh? Do you add up four 2000mAh D-cell to
equal a total of 8000mAh battery pack?
I notice currently the largest capacity D-type NiMH on the market
available to general public is produced by GP whose rating is
9000mAH per each D-cell. Incredible!
I also notice that the brand Saitek produces several expensive
charger models which seem to be smart, although I have not bought
one yet:
http://store.yahoo.com/saitekusa/batchar.html
So charging is not a problem. 4 D-cells of 9000mAh should provide
endless shooting power (I have forgotten my Physics days already,
but I suspect that an 2000mAh AA-type battery carries the same
capacity as an 2000mAh D-type battery because the 2000mAh means the
capacity. So unless you use higher capacity D-type cells to make
full use of the larger cell size, I think there is not much gain in
using 4 D cells rated at 2000mAh only. But I am not that sure, I
may be wrong.)
So 4 x 2000mAh = 1.2 V x 4 x 2000mAh = 9.6 Watt, and
4 x 9000mAh = 1.2 V x 4 x 9000mAh = 43.2 Watt.
But then I wonder whether I shall buy this kind of setup, as one
set of 4 AA 2000mAh also provides me with a full day's shooting.
If I have to use a lot of external power without CR123A, and do a
lot of focusing with heavy lens, and a lot of LCD viewing or file
transfer from camera to PC, or writing a lot with large files such
as highest resolution TIFF, then this kind of setup using D-cell
may be justified. This eliminates need of changing of battery, or
buying an extra battery holder, but imposes the problem of
accidentally unplugging the external power plug and the extra
weight and inconvenience of something on my waist.
Another type of usage I can think of is using similar kind of
battery pack for powering a powerful flash/strobe, but such setup
is better dealt with using linked up cells rather than loosened
individual cells, and the battery types need careful choosing to
match the charging pattern, recycling time, etc.
Also I can consider already commercialized setup such as:
http://www.digitalcamerabattery.com/
which can be used in the future for other cameras as well
(cross-compatibility and provides different voltages, and option of
30, 60, 90 and 120 Watt).
LP
GRrrrrrr More power.
Nick.
I own a Contax 645 medium format camera, and purchased a belt clip
battery pack known as P-8D from Contax. It holds 4 D cell
batteries. I purchased 4 Ni-MH D cells and now have an 8,000
milliampere battery pack that goes on my belt, and will power the
S2 for a VERY, VERY long time! It's worth it. Stuart.
Stuart...
Where do you get it? How much? Provide us with links or ordering
information, please. Thanks!!
Peter
--WHAT DO U CHARGE THE SET UP WITH?
'HY'
