Factory Price LED Emergency Battery Pack Emergency Converter Emergency Back up Driver Emergency LED Driver with 3.7V Built-in Ternary Lithium Battery. Built-in Battery Backup: Integrates a 3.7V ternary lithium battery for reliable emergency power supply. Self-Diagnostic Function: Features constant-power output and self-diagnosis to ensure stable illumination during outages. Multi-Protection Technology: Includes overcharge, over-discharge, overload, and short-circuit protection for device safety. Low Static Current: 0uA static current at battery terminal during outages ensures minimal energy loss. Comprehensive Certifications: Certified by CCC, ISO, CE, RoHS, FCC, and E-mark for global compliance. 3-Year Warranty: Provides a 3-year warranty covering mechanical defects and quality assurance. User-Friendly Maintenance: Equipped with test switch and LED indicator for easy monitoring and maintenance.