This document describes a simplified SPICE behavioral model for a LiFePO4 battery. The model enables circuit designers to predict battery performance by simulating voltage over time based on charge/discharge current and capacity. Key parameters like capacity (C), initial state of charge (SOC1), and number of cells (NS) can be adjusted based on battery specifications. Examples show the model simulating voltage during charge/discharge and over varying levels of capacity to characterize a sample LiFePO4 battery's performance.