More than half of all battery cells used in US light-duty BEVs and PHEVs since 2010 have been produced in the United States, as have nearly 90% of all battery packs, according to a study by a team at Argonne National Laboratory. In 2020, 70% of battery cells and 87% of battery packs were produced in the US. The large share of domestic production is due to a single player: Tesla/Panasonic.