This battery promises safety, but not energy density (it's only 130 Wh/kg, vs 250 Wh/kg for lithium-ion). As for cost, they don't claim anything, it's at the re

This battery promises safety, but not energy density (it's only 130 Wh/kg, vs 250 Wh/kg for lithium-ion). As for cost, they don't claim anything, it's at the research stage. They claim many cycles (800) and quite low loss per cycle (0.028%).