123 years ago today, on May 28, 1902 (April 21, 1902 in the lunar calendar), Edison invented a new type of battery. On May 28, 1902, Edison announced today the invention of a new type of battery. This battery is lighter in weight than previous lead-acid batteries, but has a long service life. The prolific inventor said the battery was made with a solution of nickel, iron and alkali. It can make electric cars comparable to gasoline-powered cars.