REES are used in NiMH batteries.Wow, good amount of misinformation there. Lithium mines in the US were shut down because the low price of lithium made them unprofitable. If there is a shortage of lithium the price will go up and they can be mined again. Further, the author states that REE's are needed to make lithium batteries yet I'm not aware of anyone other than TS using them in their batteries. He talks about the Mountain Pass mine being shut down by regulation but Wikipedia suggests low prices from competing mines in China was the cause and that's it's going to be reopened once again in the second half of this year.