Aquabattery, a Dutch climate tech startup developing a saltwater long duration energy storage (LDES) solution, has closed a €6 million seed investment round. The round was led by EIT InnoEnergy and supported by InnovationQuarter, Invest-NL, Init Power, and a group of business angels. Aquabattery is developing a novel flow battery that can store clean electricity in table salt and water for 8 hours or longer. When charged, the battery converts saltwater into acid and base and reverses the process when discharged. The company is preparing to launch its fourth pilot battery in Delft later this autumn. Olym advised Invest-NL and InnovationQuarter on this investment.