Vanadium

Vanadium batteries last a lifetime.  They don't deteriorate like lithium ones.  However, they are bulky and cumbersome at the moment.  They were seen to be the future for energy storage and there are very few vanadium mines around.

That made them very appealing to invest in.  I did notice that their share prices have been crawling though.  And recently, faith in vanadium must have crumbled because the price of vanadium has fallen steeply.  Ouch!  So luckily, I decided to sit and watch.