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Bill Gates Invests in Battery Maker Aquion Energy

Bill Gates, the world’s second-richest man, has invested in battery maker Aquion Energy Inc. in his third bet on an energy storage startup since 2011.

The closely held company completed the first closing for a $35 million Series D financing round that included Gates as a new investor, according to a statement today. Aquion Chief Executive Officer Scott Pearson declined to say how much Gates invested or how the startup got the personal attention of the Microsoft Inc. co-founder and chairman, who also invests via his fund Cascade Investment LLC.