It has. But the decisive factor is the battery capacity, which is 94.72Wh. The capacity is always the same, but at a lower voltage you can draw longer or more amps, hence the difference in the figures. At a nominal voltage of 14.8V you can draw 6400mAh. Then the calculation is 6400mAh * 14.8V = 94.72Wh. If the voltage is only 3.7V, you can draw 25600mAh from the 94.72Wh. 25600mAh * 3.7V = 94.72Wh