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Recent technological advances in power electronics and electrical storage have increased interest in the arbitrage business based on Battery Energy Storage Systems. With this objective, the present work develops a Mixed-Integer Linear Programming model for obtaining optimal electricity sale\purchase strategies with batteries. For each configuration (battery size /inverter size), the model provides an optimal trading strategy. Using this strategy for different configurations and with the current market prices, some financial indicators are calculated in order to select the optimal configuration. Finally, our analysis considers the significant technological progress that has occurred in recent years, the effects on profitability of a reduction in the battery cost, and of an improvement both in the round-trip efficiency and in the battery's lifetime (in terms of the number of cycles). The results indicate that, with current technology, the …