Cloud Defensive 18350 unprotected, flat-top cell. Note that the other common brand weapon lights are not rated for un-protected cells such as this battery.
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Surefire

Surefire G2X Pro 15/600 Lumen LED Flashlight – Polymer & Aluminum Click Style Switch – Black
Original price was: $99.00.$90.99Current price is: $90.99.
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