Ans: NiCAD stands for Nickel-cadmium whereas NiMH represents  Nickel-metal hydride. These are basically the battery cell composition types that tell you what materials and chemicals are used for the construction of the batteries. NiCAD batteries are suitable for longer reliability as they offer a high discharge rate as well as for their affordability. NiMH batteries on the other hand offer higher energy density, but with a reduced life cycle.