Is this the start of flow batteries fighting back the Lithium onslaught?  Flow and related technologies have had a tough time in the last few years, after showing such great promise. The demise of Imergy, Gildemeister and Aquion (salt water) I know spooked some investors in other flow battery companies.   We continue to see new start ups offering domestic scale flow batteries too, I saw another 'pitch' this week at the London EcoSummit. It seems obvious that there is a place in the market for both technologies, each suited to their own best uses and environments. It just seems so far the tech hasn't quite been there. redT and VizN have been making good headlines of late. Let's hope it is a sign of the technology maturing and earning its place in the market.