The document surveys existing mechanisms in energy-aware routing for Mobile Ad hoc Networks (MANETs), emphasizing the importance of managing energy consumption due to node mobility and limited battery resources. It reviews various energy-aware routing protocols, particularly those based on the Dynamic Source Routing (DSR) and Ad hoc On-Demand Distance Vector (AODV) protocols, which aim to enhance network lifetime and efficiency by optimizing energy usage. Different energy-aware metrics and protocols are discussed, highlighting their roles in minimizing energy consumption and extending the operational life of the network.