Abstract: A new flat cell battery design is provided which incorporates a cathode and an anode terminal which are located in respective corners of a battery body. By locating the cathode and anode terminals in respective corners of the flat cell battery, the storage capacity and energy density of the battery are increased compared to conventional flat cell batteries. The corner terminal design of the present invention significantly improves packaging efficiency over common-edge terminals. In addition to increased volume efficiency, corner terminals improve thermal and electrical distribution properties of the battery. Physical separation of the terminals to adjacent or opposite corners also reduces the probability of inadvertent external short-circuit, resulting in improved safety.