The efficient management and monitoring of lithium-ion batteries are critical for optimizing their performance, enhancing lifespan, and ensuring safety in various applications, such as electric vehicles, renewable energy storage, and portable electronics. A comprehensive Lithium Battery Management and Monitoring System (BMS) integrates multiple functions, including state-of-charge (SOC) estimation, state-of-health (SOH) tracking, temperature regulation, voltage balancing, and protection against overcharge, over-discharge, and thermal runaway. This paper presents a novel BMS architecture that incorporates real-time data acquisition, intelligent algorithms for SOC and SOH estimation, and advanced protection mechanisms. The system utilizes embedded sensors and microcontroller-based circuits to monitor the battery parameters and communicates with external devices through a user-friendly interface for data visualization and decision-making. Experimental results demonstrate the effectiveness of the system in enhancing battery efficiency, prolonging operational lifespan, and preventing potential failures, making it a robust solution for modern energy storage systems. The proposed BMS provides a scalable, cost-effective, and reliable solution for the next generation of lithium battery-powered devices and systems.