This study demonstrates the excellent electrochemical performance of the hybrid carbon fluoride (CFx)/silver vanadium oxide (SVO)/graphene(G) cathode and its potential utilization in the Juvenile Salmon Acoustic Telemetry System (JSATS). The impedance increase caused by LiF formation is effectively addressed by silver metal deposition during SVO reduction. The coexistence of graphene additive reduces the initial voltage delay; thus, a prolonged operation voltage is observed with enhanced electronic conductivity, with specific capacity of sim;462 mAhg-1 at 5C rate and 661 mAhg-1 at 1C rate. The peak current delivered from the asdesigned hybrid cathode is improved over the commercial Zn/Ag2O batteries, suggesting battery size/weight reduction critical for the JSATS transmitters. © 2011 Elsevier B.V. All rights reserved.