Well Albert, now you know why this camera wasn't an instant success (or successful at all) in the marketplace.
Here are the IDs for the two chargers worth considering from the web site DJ recommended above:
http://www.batterysupply.com/mh-c204f-4aa220dc.htm
http://www.batterysupply.com/mhc401fs.htm
Leave the batteries in the charger when not using the camera because nMh batteries go dead without use very quickly. The chargers above have an automatic "trickle charge" feature to keep the batteries up and ready.
Up until Irakly's source completes the Mac version of the new RAW developer, I continue to use J-Peg large as my setting. J-peg large eliminates any small buffer issues, and is very fast to shoot with. Due to the apparent broad dynamic range, the J-pegs from this camera are the best I've seen from any other DSLR . I will occasionally use a Tiff setting for an important commercial shot, but there is little difference IMO. My camera uses firmware version 107 BTW.
I have most settings as standard except chroma is set on +. I use the histogram setting & highlight warning for the LCD review as the screen is useless for evaluating anything other than composition. Read your manual to set these.
Most of all, learn to read the histogram, it is your best friend when using this camera.
I took this camera to Martha's Vinyard last summer and shot hundreds of images. Except for having to carry around 2 extra battery carriages, it shot all day long on J-peg large
with zero misses. I strongly suggest 3 sets of 2200 mAH sized nMh batteries for day long outings. I then recharge in 2 chargers at night to be ready the next day.
What imaging program are you currently using? If PhotoShop, what version? The relatively "dull" images you are experiencing is actually an advantage compared to other DSLRs. It is an indication of the wider latitude this camera produces compared to even the mighty Canon 1Ds.
Even in J-peg Large I rarely experience blown whites with the ND. I prefer a flat looking file when importing to Photoshop for the same reason I prefer it when scanning film negs. PhotoShop is a FAR, FAR more powerful image processing engine than could ever be included in a camera.
P.S. Go to the Gallery here to see some ND shots.