Electro mobility is developing in a rapid pace. Volvo Penta and The Volvo Group are developing hybrid and fully electric solutions for a more sustainable future. One of the biggest limitations can be found in the batteries and its capacity affecting both power and range. Temperature management for batteries is important for a sustainable battery usage, if they are not used within the correct operating temperatures there will be both a performance and lifetime decrease. This report will handle a product development project, from idea to prototype build and final production proposition. Finding the best and most compatible cooling solution for Volvo and keeping the battery operating temperature within the boundaries given from the battery suppliers. The cooling solution includes the Active Cooling Unit, system layouts for combined cab climate and Electrical Storage System temperature management, including heating possibilities. The system is dimensioned of cooling 8 kW at 48°C ambient or coolant at 52°C with a fully operating system.