Traditional data centric routing protocols are for stationary sensor networks so these are not appropriate for mobile ad hoc sensor networks where sensor nodes may move and operate as an actuator. In order to maximize the life time of mobile ad hoc sensor networks, we propose a power balanced routing protocol based on a multiple path routing method for ad hoc sensor networks. The proposed routing protocol is referred to as a Power Balanced Multipath Routing protocol (PBMR). The PBMR enables balanced power consumption in a network by managing the routing reply time. Performance comparison of the PBMR to other existing protocols shows that the PBMR is able to effectively cope with mobility-induced route failures. In particular, it extends network lifetime by up to 50%.