These might replace other kinds of capacitors, but at the listed energy density, there is no way they are going up against cell phone batteries or car batteries

These might replace other kinds of capacitors, but at the listed energy density, there is no way they are going up against cell phone batteries or car batteries. According to wikipedia, the lithium iron phosphate battery has an energy density of 220 mWh/cc. These are weighing in at 1.36 mWh/cc, according to the article. And existing battery chemistries can already charge fast enough such that the limiting factor for electric car recharge times is the grid. My Nissan Leaf can charge most of the way in 25 minutes at a L3 charging station. But PG&E levies enormous fees for people who want to pull down that kind of power, so there isn't a single operable L3 station in the whole bay area.