broadsword
Brigadier
I recall a pretty famous Solar company in western USA based around leasing solar-trucks and claiming renewable energy tax credits that took quite a few years to unravel - and they didn't have anywhere close to the number of trucks they claims they were leasing out.
All I need to see is that they're 14 years in the running without a product and on Series E funding. Startups don't go to Series E unless they are having serious issues or coming up with a new product. This Colorado company is obviously not in the latter case.
They're not literally trying to defraud you, just selling a pipe-dream to suckers.
SpaceX managed to successfully fly their Falcon 1 within 6 years of company founding. By 8 years, they already had their Falcon 9 and by 10 years, they were taking over commercial contracts. Ming Yang started producing wind turbines within 1 years of founding, created their innovative SCD turbine by the 4-year mark, and offshore turbines by year 7. BYD created their auto division in 2003 and started producing the world's first PHEV within 6 years. The story goes on and on. 14 years and Series E means it's probably going to go bankrupt soon rather than produce any product.
Battery development takes years. Sodium-ion batteries took the Chinese companies years to develop. But now they have the products and Prieto just released their latest prototype.
Their claim held up for 14 years.
SpaceX had help. Plenty. Just go to the relevant thread to read up.