Power up your smart door lock with this high-capacity 4200mAh lithium battery pack. Designed specifically for fingerprint-enabled smart door systems, this sleek black battery unit provides reliable, long-lasting power to keep your security system running smoothly. The compact design features a micro-USB charging port for convenient recharging when needed. Built with durability in mind, the robust housing protects the battery cells while maintaining a professional appearance that blends seamlessly with your door hardware. Perfect for both residential and commercial smart lock applications, this battery pack offers the perfect balance of capacity and convenience. The battery's substantial 4200mAh capacity means fewer charging cycles and more reliable operation of your smart door's fingerprint scanner and electronic components.