**6.5 Nickel based batteries**

This type of battery is specially used in those applications having long cycle or fast charging conditions and extreme climate. Nickel based batteries work correctly in low temperature (less than −40 degree centigrade) environment; also it has long cycle and design life as well as good cycling pattern. Hence in can be said that these batteries are competitive technology choice for the areas where renewable energies are stored and cyclically, and it is considered as world's most power full battery. In future with the advancement, their life cycle, and temperature ranges can be increased; alkaline batteries cannot be replace by any other type if battery because of their operational safety, reliability, performance and durability to face adverse environment [9].
