While it's not official, TM reps have said that the same batteries are used in the 60kWh so 60 is 70.% of 85kWh. So how much does each cell weigh and how many cells are in the 85kWh pack? ncr18650a are 46.5g each and supply 2950mAh at 3.6V then they produce 0.01062kWh each so there would need to be at least 8000 cells (is that right, I was thinking more like 7000), so that would weigh 372kg. 30% weight savings then equals 247lbs.