XL Batteries, an energy storage company that is building the lowest-cost, safest and most efficient form of long-duration energy storage (LDES), announced a $7.5 million investment from Merrin Investors, the mission-driven family office of entrepreneur and philanthropist Seth Merrin. This new funding accelerates XL Batteries' ability to scale its operations, enhance grid resilience, and support energy independence by reducing reliance on foreign supply chains.