NiMH cells are particularly advantageous for high current drain applications, due in large part to their low internal resistance. Digital cameras with LCDs and flashlights can draw over 1000 mA, quickly depleting alkaline batteries. NiMH can handle these current levels and maintain their full capacity.
Now that the technology is reasonably mature, NiMH batteries have begun to find use in high voltage automotive applications. The energy density is more than double that of Lead acid and 40% higher than that of NiCads
They accept both higher charge and discharge rates and micro-cycles thus enabling applications which were previously not practical.
Like NiCd batteries, Nickel-metal Hydride batteries are susceptible to a “memory effect” although to a lesser extent. They are more expensive than Lead-acid and NiCd batteries, but they are considered better for the environment.
Robust – NiMH batteries also tolerate over charge and over discharge conditions and this simplifies the battery management requirements.
Low internal impedance.
Flat discharge characteristic, stable voltage supply (but falls off rapidly at the end of the cycle)
Wide operating temperature range.
Rapid charge possible in 1 hour
Reconditioning is possible.
Environmentally friendly (No cadmium mercury or lead)