In mobile ad-hoc networks, energy conservation is necessary due to increasing gap between the power consumption requirements and power availability. In a MANET, the energy depletion of a node does not affect the node itself only but the overall network lifetime. To maximize ad-hoc networks lifetime traffic, algorithm is introduced which is the extension of DSR. Proposed algorithm works on network layer. Energy consumption can be reduced by implementing multipath routing. The performance of proposed algorithm i.e. of modified DSR is better than conventional DSR in terms of network lifetime.