XL Batteries is a Marlborough, Massachusetts startup building an Organic Flow Battery for grid-scale, long-duration energy storage. Spun out of Columbia University chemistry research, the company uses proprietary organic molecules dissolved in pH-neutral water instead of vanadium in acid - producing a non-flammable, non-toxic, non-corrosive battery assembled from commodity pumps, tanks and tubes. The pitch: safe, scalable storage that can run for 10, 20, even 50 hours by simply enlarging the tanks, at costs targeted below lithium-ion for long durations.
Advanced Battery Concepts is a Clare, Michigan battery maker that did something contrarian: instead of chasing lithium, it went back to lead-acid and reinvented it. Its patented GreenSeal bipolar architecture cuts lead content while boosting cycle life, and the company has licensed the design to global battery giants like Clarios, EnerSys, Exide, Crown and Trojan. With its EverGreenSeal line and BatteryBarn utility systems, ABC builds non-flammable, fully recyclable, domestically manufactured energy storage for critical infrastructure and the grid.