When we last looked at Form Energy, the aqueous battery specialist part funded by cash from Bill Gates Breakthrough Energy Ventures fund, we were annoyed at the huge amount of publicity it received primarily because Gates was among the investors. Now as it moves within a few years of its first installation, we find ourselves annoyed at how it alone has sparked a debate about whether Lithium Ion is the right battery technology to store renewables grid energy. There are hundreds of other companies that should have sparked that debate – and there are hundreds of worthy investments which have a chance at becoming either long duration storage or simply a rival to Lithium Ion. We talked this week to…