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Technology, in many cases, wouldn't be much without the use of batteries. Using them more often than we realize, we should always be sure to have extras around. HeartRateMonitorsUSA.com has a full range of batteries for your watches, calculators, keyless entry devices, handhelds, and home medical devices. Shop now and find items like the CR2430 Battery, Energizer CR2025 Battery, AG13 / 357A / LR44 Alkaline Button Cell Battery, Polar Batteries for Polar Products, and More!