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With this #1819 four-pack of standard LR41/L736 Alkaline Batteries from Pelican, you can power their 1810 Keychain Light and many other electronics, including watches, calculators, car remotes, and heart rate monitors. Each of the coin/button cells feature 1.5V of output power, so they produce a combined 6V together. The batteries are included with the Keychain Light and are provided here as spares or replacements.