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The first hybrid satellite in the geostationary orbit in Korea is being developed by KARI (Korea Aerospace Research Institute) and ASTRIUM based on the EUROSTAR 3000 platform. The hybrid satellite accommodates multiple payloads of meteorological imager, geostationary ocean color imager, and the Ka band satellite communication payload into a single spacecraft platform. The energy storage function is required during launch followed by transfer orbit phases, during eclipses and in case of large peak load demands. The lithium-ion batteries are the first choice for most space applications their advantages compared to previous electrochemical batteries. The SAFT VES140S lithium-ion cells have been successfully qualified in the W3A satellite in 2003 with EUROSTAR 3000 platform. The hybrid satellite battery is based on EUROSTAR 3000 experience in the cell module level but changed design in battery assembly level to accommodate hybrid satellite mission and structure design. The hybrid satellite battery has been fully tested and integrated with SAFT VES140S industrial lithium cells. This paper gives an overview with the description of the cell modules design, of the battery design and architecture and of management on orbit. This paper gives also the battery performance on ground and the battery behavior expected on orbit.