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Almost all SureFire illumination tools are powered by 123A lithium batteries. In fact, we pioneered the use of these compact, lightweight, energy-dense devices in flashlights. We use them instead of standard alkaline batteries because of their many advantages.
Product Features
Longer Shelf-Life. Lithium batteries have a 10 year shelf life
Higher Power Density. For a given size, it would take two alkaline batteries
Less Weight. For a given size, lithium batteries weigh about half as much as alkalines, but produce more power.
Wide Temperature Tolerance. Lithium batteries greatly outperform alkalines
Better Voltage Maintenance. A lithium battery maintains consistent voltage
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