(NHK)
The push for electric vehicles and green energy is driving the development of battery technology. Manufacturers in the industry have descended on Tokyo for an exhibition to show their latest developments.
More than 100 companies from Japan and around the world are taking part in the three-day event.
Hitachi Zosen is displaying an all solid-state battery. It can withstand extreme temperatures ranging from minus 40 degrees Celsius to over 100.
