Cost of 200lb
x 20 years 2M/200 rule of thumb, serveral $1,000 per / pound is what will be paid to get a pound out of a large aircarft (per aircarft). Or 1M could invested in engieering, to get a pound out of new deisgn were several K will be produced. So if 200 pounds of batteries = 50M in egeering and 10K per aircraft is no brainer to go for it.