What is it
It is a rechargeable battery that made portable tools and other things more easier for the first time. And cheaper then a lead battery. At the time things were weird and expensive/pricey.
When and Where
The battery was invented in 1899 in Sweden by an inventor.
It was invented to make things like flashlights more efficient and last longer.
It was invented by a person from Sweden who was an inventor named Waldemar Jungner.
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Chemistry Electrochemistry part 33 (Secondary Battery: Lead, Nickel Cadmiuml) CBSE class 12 XII
The battery was made by Waldemar. The battery was rechargeable and helped out many people even though it was a little expensive. Flashlights and other battery using items were more useful.