In Mobile Ad-hoc Network (MANET), it is assumed that the IP address of the destination terminal is known, but it is not in case of emergencies such as disasters. In addition, MANET terminals are assumed to operate on battery power, and they consume battery power by relaying data to other terminals. Therefore, the network life is expected to be extended by selecting the route considering the remaining battery power. AODV-SOS, a routing protocol that enables rescue request communication even when the IP address of the destination terminal is unknown, has been proposed, but it does not take the remaining battery power into account. We have proposed a new routing protocol Power Aware Routing-AODV-SOS(PAR-AODV-SOS), which is battery-aware routing protocol for AODV-SOS. In this paper, we propose additional improvement of PAR-AODV-SOS to introduce changing packet retransmission probability depending on the number of neighboring terminals for the purpose of additional battery life extension and evaluate its performance by simulation.