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This Project describes the application of Internet-of-things (IoT) in monitoring the performance of electric vehicle battery. It is clear that an electric vehicle totally depends on the source of energy from a battery. However, the amount of energy supplied to the vehicle is decreasing gradually that leads to the performance degradation. Battery monitoring system is consists of two major parts i) monitoring device and ii) user interface based on experimental results, the system is capable to detect degraded battery performance and sends notification