Factory Price 3.7V Built-in Ternary Lithium Battery LED Emergency Driver Panic Emergency Powerpack Backup Ballast Emergency Light Kit Panic Light Ballast. 3-Year Comprehensive Warranty: Covers all mechanical defects with free parts and labor for 3 years. Built-in Ternary Lithium Battery: Integrated battery ensures reliable emergency power during outages. Self-Diagnostic Function: Automatically checks system status to ensure stable illumination. Multi-Protection Technology: Protects against overcharge, over-discharge, overload, and short circuits. Wide Voltage Input Range: Accepts 100-277VAC 50/60Hz for versatile global application. Low Static Current: 0uA static current at battery terminal minimizes energy loss. Fast Switchover Time: Backup power activates in less than 1 second during emergencies. Multiple Safety Certifications: Certified by CCC, CE, RoHS, FCC, E-mark, and IEC standards.