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Last month Formula E's new battery went through its first full race simulation ahead of its introduction next year.

The test of the McLaren Applied Technologies product was a significant moment in the electric single-seater series' technical progression, as it targets ditching the mid-race car swaps for the 2018/19 season.

McLaren's battery will almost double the amount of usable energy currently available from the Williams Advanced Engineering-built unit to 54Kw/h, so drivers can complete an entire race distance in one car.

The current battery, and what gains are coming in the future, are profiled here in the first of a new series of videos focusing on the key technology behind Formula E.