Wireless Sensor Network is used in an extensive assortment of applications like enemy vehicle motion detection, surveillance of the environment. For the network to be operational and for longer maintenance of WSN low-cost sensor nodes are the need of the hour. There are many constraints in the WSN network like deployment constraints, energy constraints and hardware constraints which must be handled in a careful manner in order to improve network lifetime. To improve the network lifetime there are techniques which come under beam forming, connectivity factor, coverage and harvesting factors. In this paper, the survey is done on the innumerable delineations of network lifetime and the methods which can help in improving the network lifetime. Battery Level management during the routing process as well as approaches to identify and reduce the number of dead nodes will also improve lifetime.

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