Ever since I've heard about it, I've been rooting for the liquid metal battery. http://news.mit.edu/2016/battery-molten-metals-0112 http://news.mit.edu/2016/ba

Ever since I've heard about it, I've been rooting for the liquid metal battery. http://news.mit.edu/2016/battery-molten-metals-0112 http://news.mit.edu/2016/battery-molten-metals-0112 Last I read they're working on issues with the high-temperature seals. It'd be awesome to have a big shipping container in my neighborhood that just stores all of our energy for use during peak/off hours.