Sodium batteries are irrelevant, as they have no advantages over lithium batteries (except maybe a slight cost decrease). At the same time Japanese engineers pr

Sodium batteries are irrelevant, as they have no advantages over lithium batteries (except maybe a slight cost decrease). At the same time Japanese engineers prototyped magnesium-ion batteries, which will double capacity of Li-Ion: http://www.japantoday.com/category/technology/view/japanese-team-develops-high-energy-density-magnesium-rechargeable-battery http://www.japantoday.com/category/technology/view/japanese-... Can't wait to see them entering mass production.