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Alpatronix [BX440] 4000mAh Rechargeable Battery Charging Case for Samsung Galaxy S9 (5.8-inch) Compatible with Qi Wireless Charging Overview: Designed by Alpatronix to improve the performance and battery life of your Samsung Galaxy S9 (Not compatible for S9 Plus). Features: Slim, lightweight and compact design for portability. 4000mAh built-in battery provides your Samsung Galaxy S9 up to 1.5x the needed charge.Top/bottom slide-in design for better security and easy installation. Qi-enabled, supports universal wireless charging. Power LED Indicator - Will indicate the level of power your battery case is currently charged.Covered buttons for easy access to all ports, switches and buttons. Specifications: Capacity: 4000mAh Li-Polymer Rechargeable Battery Product Dimensions (L x W x H; inches): 2.87 x 0.66 x 6.2 Weight = 4.16 ounces Input (micro USB): DC 5V-1.8A (Max)Input (wireless): DC 5V-1.2AOutput Voltage: 5.0±0.25V/1.8A (Max)Protection: Short circuit and Overcharge Compatibility: Samsung Galaxy S9 (5.8-inch) micro USB-C port (can be used for data transfer for Android and PC compatible devices such as Macbooks and Laptops to sync music, photos, files and videos). UL Certified Battery: highest certification for batteries to ensure the safety of our customers (note: using aftermarket USB cables and/or using USB chargers that supply more power than the input of this product can cause extreme heat generation, explosion, or fire... as is the case with any electronic product). FCC, CE and RoHS: meets all consumer regulatory requirements in the United States and the European Union. Package Contents: 1x battery case 1x lifetime warranty card 1x user manual Satisfaction Guaranteed: We offer a LIFETIME hassle-free warranty to ensure long-lasting coverage, power and protection!