As the demand for portable electronic devices continues to rise, so does the need for efficient and sustainable energy storage solutions. The proposed battery case leverages the unique properties of banana fibre, such as its high tensile strength, lightweight nature, and biodegradability, to address the growing concerns associated with traditional battery cases made from non-renewable resources. Banana fibre, derived from agricultural waste, offers a promising alternative that not only reduces environmental impact but also promotes rural livelihoods through the utilisation of readily available resources. Through a combination of material engineering and manufacturing techniques, the banana fibre battery case exhibits excellent mechanical properties, ensuring robust protection for the battery while minimising weight and bulk. The inherent flexibility of banana fibre allows for seamless integration with various battery sizes and shapes, providing a versatile solution for different electronic devices. Moreover, the banana fibre battery case demonstrates remarkable thermal insulation capabilities, protecting the enclosed battery from temperature fluctuations and optimising its performance and lifespan. Additionally, the high moisture absorption properties of banana fibre help mitigate the risks associated with moisture-induced damage to the battery, ensuring its longevity. By incorporating banana fibre as a primary material for battery cases, the proposed solution offers a sustainable and renewable alternative that minimises the reliance on fossil fuel- based resources. The utilisation of banana fibre not only reduces waste and environmental pollution but also supports local economies by creating value from agricultural by-products.