The Fenix ARB-L18-2900L is a high-capacity 18650 Li-ion rechargeable battery specifically engineered for extreme environments. It features advanced cold-resistance, allowing it to operate in temperatures as low as -40°C. Designed for safety, it includes a protection circuit in the anode to prevent short circuits, overcharging, over-discharging, and overheating. Additionally, the battery is equipped with pressure relief vents to expel waste gas and prevent internal pressure buildup, ensuring maximum reliability for your high-drain devices like tactical flashlights.