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Many of the Telecommunication Systems used by companies of the Electric Sector (Utilities) are essentials and causes direct impact on the main business, being indispensable that it work without interruptions. As some of the outages on the Telecommunications are caused by associated energy systems, every improvement done on these systems affects the process chain. But as those systems act on the background, sometimes they hide systemic problems. This situation can be seen currently in a specific type of battery that is common in this area. Looking for to solve this problem, Eletrobras Furnas has been researching, together with Telecommunications Research and Development Center (CPqD), the application of the lithium-ion battery technology, a pioneer initiative in Latin America. This work presents details about the research and the strategy adopted by the company since 2005 to introduce this technology in Brazil.