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Our standard 7.v4 battery delivers ample heat for hours on end via our Mobile Warming Technology®. We use only the highest quality Lithium-ion batteries to ensure long-lasting power and battery life. These 7.4-volt batteries are compatible with select Fieldsheer 7.4-volt Heated Jackets and Vests. To learn more about which garments are compatible with what batteries, check out our Mobile Warming® Technology Battery Compatibility Chart.