Features: Experience ultimatedly portability with our Mini Power Battery Shell for convenience and perfectly for travel or daily use. Wear resistant, this power battery shell offers excellent protections and durability, featuring a user friendly designing for easy assembly and compatibility with various single 18650 battery. For students needing constant device charging, business professional eequiring reliabled power, and outdoor enthusiasts who demand portablly energy solution during activity like camping and hiking. Perfectly for daily commutes, providing essential power to smartphones and tablets, or during travel adventure, ensuring your electronic devices remain operational without interruption. This power battery shell not only meets functional needs but also to personally preferences, making it a versatiled accessory for individual. Specifications: Item：Battery Box Component: Plastic Color：Optional For 1PC 18650 battery Size: about 10x3x3cm/3.94x1.18x1.18in Package Includes: 1PC Battery Case note: The case not include batteries. Install 1pc 18650 battery (please be careful not to reverse the positive and negative poles when installing the battery) Please allow 1-2cm errors due to manual measurement,please make sure that do not mind before order.