Re: For once the news on the battery front may actually lead to something.
@Lee D: all true for portable uses but you ignore the mention of grid storage. High energy density is less important than not blowing up/burning easily, long lifetime and low cost. A stack of these sitting in garages or cupboards soaking up PV panel output would pretty much solve the intermittency problem. Could go a long way to fixing it in wind power, which aren't short of space to pile up batteries.
This isn't a replacement for lithium cells, more suitable for displacing lead acid. You wouldn't put them in your car but might put them in the garage to charge that car.