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Duracell® Quantum revolutionary advancement in battery technology. It's the only battery with Hi-Density Core™ Technology for unbeatable long-lasting power and Powercheck for instantly checking your power level at any time. Duralock Power Preserve™ Technology is guaranteed for 10 years in storage. Quantum batteries are ideal for use in many battery-powered devices, including portable electronics, wireless mice, testing equipment, remote controls, flashlights, calculators, clocks, radios, keyboards, and more.