US-based battery manufacturer Aquion Energy has closed $55m in series D funding from investors including Bright Capital and Advanced Technology Ventures.

Aquion Energy manufactures proprietary Aqueous Hybrid Ion batteries and battery systems for stationary energy storage applications. Their batteries are optimized for off-grid, microgrid and energy storage on a commercial and industrial level.

Investors in this series D financing include Bill Gates, Yung’s Enterprise, Nick and Joby Pritzker through their family’s firm Tao Invest, Bright Capital and Gentry Venture Partners. This round also attracted reinvestment from Kleiner Perkins Caufield & Byers, Foundation Capital and Advanced Technology Ventures.

Due to strong investor…