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In an isolated microgrid, the electricity produced by wind and/or photovoltaic generators in good conditions (sunny weather, wind) must be stored and consumed other times, according to the consumer's profile. The most frequently used storing devices are the rechargeable batteries. Knowing their characteristics allows us an optimum sizing in terms of their operation and economic efficiency. The current article shows us a method by which, following some experimental measurements we can identify data about a SLI Lead battery and how they can be used in Peukert's formula for calculating the effective capacity of such a battery at different discharge currents.