
Ruben's inventions revolutionized battery technology. In the midst of World War II, for instance, Ruben devised the mercury cell, which packed more capacity in less space and was durable enough to withstand difficult times Sverre situations in North Africa and the South Pacific, where are zinc carbon batteries used in flashlights, mine detectors, and walkie-talkies could not fail. P.R. Mallory manufactured millions of mercury cells for the war effort. And since then, was created in a short time The Mallory Battery Company.
In the 50's, Samuel Ruben continued to improve the alkaline manganese battery, making it more compact and durable as never before. At the same time, Eastman Kodak introduced cameras with built-in flash that required more energy than it provided the carbon zinc battery. The cameras needed alkaline manganese cells but in a new size, the AAA. Mallory made and also licensed the technology to other companies, because at this time, the company did not distribute their products to consumers.

Today, Duracell's Story continues to add pages, but now part of the Gillette Group and is the world's leading manufacturer in the market for alkaline batteries. The tradition of innovation implemented by Ruben and Mallory has been in the new Duracell batteries like Duracell Ultra with M3 technology. Duracell also markets premium lithium, silver oxide and zinc air batteries.
Headquartered in Bethel, Connecticut, Duracell sells its batteries throughout the world, marketed primarily under the Duracell brand.
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