High-performance 3.7V 602040 lithium-ion battery with 400mAh capacity for extended use in adult toys. Premium cell structure ensures stable power output and enhanced safety during operation. Ultra-thin 6.0mm thickness with precision aluminum alloy casing for seamless integration. Advanced polymer electrolyte prevents leakage and overheating in intimate environments. Optimized discharge curve maintains consistent vibration intensity throughout use. Bulk pricing available for wholesalers needing reliable power solutions. Ideal for discreet pleasure product manufacturers requiring compact energy sources. Certified under UN38.3 for international shipping compliance.