In the wake of the auto industry collapse in 2010, Toyota made a move that many industry watchers applauded. It partnered with electric vehicle maker Tesla to incorporate its battery technology into future Toyota cars and SUVs. Tesla was seeing success in a very niche market with its Tesla Roadster, so it seemed like a safe bet for the Japanese company to bring it to the mainstream. Four years and one spectacularly failed vehicle later, Toyota is throwing in the towel on pure electric vehicles in favor of hydrogen fuel cells.