In MANET, communicating devices are battery powered. Unfortunately, in many practical usage scenarios, batteries cannot be replaced or recharged. Moreover, battery exhaustion of nodes may not only result in low connectivity but can also lead to network partitioning. With the aim of extending MANET lifetime, energy-aware routing protocols have been proposed. Three main approaches are identified in the related literature [1]. First, maximum lifetime routing that seeks to balance energy expenditure among mobile nodes. Second, power-save approach that searches to minimize energy loss during the inactivity periods. Third, power-control approach where nodes adjust their transmission power so that a good compromise is found between goals of: maximizing network connectivity and minimizing energy dissipation.