Product descriptions from the supplier High Capacity: 4000mAh provides long-lasting power for LED torches. 3.7V Voltage: Ensures compatibility with various LED flashlights. Durable Construction: Designed for reliable performance in extreme temperatures (-20~60℃). Long Lifespan: Expected to last up to 800 cycles, ideal for frequent use. Multiple Certifications: RoHS, CE, FCC, and ISO9001 ensure safety and quality. Stable Discharge Output: Supplies steady current to keep