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The company expected its products to last many charge/discharge cycles, [6] twice as long as a lead-acid battery. Costs were claimed to be about the same as with lead-acid. [7] [8] In October 2014, they announced a new generation with a single stack reaching 2.4 kWh and a multi-stack module holding 25.5 kWh. [9] [10]
The principle of edge-lighting was discovered early and used for commercial signs. U.S. patent 1,139,723 for an "Electric edge lit sign" was filed on July 31, 1914, and granted in 1915. [1]