Ni-Cd-----> Nickel Cadmium usualy of 750mAh(mAh stands for Milliamp Hour)
Ni-Mh-----> Nickel Metal Hydrite usualy of 2500mAh
NiCd costs around Rs 100-150 pp
NiMh costs around Rs 250 pp
the chargers for each is of different type..NiMh charger costs another Rs300 (maybe more)
if u have to buy for a digital camera, invest on a NiMh one!!
as NiCd wont last long! in my case..
Duracell lasted for 15 pics, Eveready 750mAh lasted for 15... and Sony CyberShot2700mAh lasted for 65pix
please look @ *www.shortcourses.com/choosing/batteries/13.htm