Edison did not invent the battery. About 1875-1880, his assistant Nikola Tesla made the first practical long lasting storage battery improving on over 100 years of prior work.
1856
in 1878
in 1880
he didn't
1879
In 1891, of course!
it took him 1 year to invent the lightbulb
He invented the electric light in 1880
Edison invented the minor's safety lamp in the year 1914.
December 31, 1879
1900 - 1910 Invented and perfected the steel alkaline storage battery and made it a commercial success.1902-1903 Worked on improving the Edison Primary Battery. Continued to invent improvements to his phonograph - his favorite invention - and associated cylinders.
Around 1880