The number of companies who say they have a “breakthrough” in battery design that will overtake lithium ion batteries has now got to the point where we cannot count them all on the fingers of two hands. But only one or two of these have managed to get sufficient funding, and get over initial difficulties to the point where they have a product with chemistries like nickel hydrogen, zinc alkaline, sodium sulfur, aluminum, ion, zinc oxide, zinc air and iron oxide. In almost all cases there are two problems – either the materials cost a fortune, or the reaction isn’t really reversible – before innovators like EnerVenue, Urban Electric Power, Enlighten Innovation, EOS, Phinergy and Form Energy – solve the…