Unlike most battery articles, this one is credible. It's about the guy who did A123, which made a very good lithium battery (one that doesn't have thermal runaway and doesn't catch fire), but couldn't do it economically.
A123 makes some of the best and cheapest cells on the market. They're immensely popular in the DIY EV community because they get you more ranger per dollar than anything else you can source in small quantities.
