Power-optimization is an essential issue for all types of mobile hosts in the network. This paper proposes a new approach for optimizing power consumption in Mobile Ad-hoc NETworks (MANETs) that consents to maximum life time of mobile hosts while transmitting a packet from the source to destination. It can be implemented by avoiding nodes which has a minimum residual battery power. The proposed approach is implemented by introducing a threshold value on each node and transmitting the equal length of packet on the route. This threshold indicates whether the node should be included in making routing decisions for a packet and length of the packet considered for equal power consumption. Extensive simulation results are presented to verify the effectiveness of the proposed approach.