 Between 1977 and 2000 Sony Energytec started production of many primary and secondary battery technologies, such as Silver-Oxide batteries, Alkaline-manganese dry batteries and Lithium-ion batteries.In 2000 Sony Energytec merged with Sony Motomiya to form Sony Fukushima.In 2006 Sony Fukushima merged with Sony Tochigi to form Sony Energy Devices Corp.

Esstalion Technologies, Inc was established in June, 2014 as a joint venture between Sony and Hydro-Québec.