It’s a range, but LFP is generally in the 90-160wh/kg and NMC (lithium manganese cobalt oxide) tops out around 275 wh/kg.
It’s not quite double, but doubles the density of most mass manufactured cells. Time will tell if it gets to scale, but it’s a step in the right direction.
I had heated floors in a Chicago apartment. I would lay tomorrow’s clothes on the floor at night and they were toasty warm when I put them on in the morning. Then, I’d put my blanket on the floor when I left for work and it would be nice and warm when I was ready to jump into bed at night.