For all SureFire and other Lithium battery powered lights.
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this info is from Surefire;
High-performance 123A 3V batteries
Optimized for high-drain use in flashlights
Wide temperature tolerance
Built-in heat and fault (short-circuit) protection
10-year shelf life
Made in the USA to Surefire specifications
Brenda, we think any 123-3V battery will work, this model, a streamlight CR123A will also work, the key in replacing your old battery is to use the same model. Streamlight part number 2 pak = 85175 or 12 pak = 85177