Mophie Juice Pack Slim Wireless Charging Battery Case Cover - Black For Samsung Galaxy S8+  39 Hours talk time
The juice pack battery case made for Samsung Galaxy S8+ gives you extra battery power when you need it. And it's compatible with Qi wireless systems like those found in coffee houses, furniture, and many new cars. 
Power When and Where You Need It 
The juice pack battery case features a built-in 3,300mAh battery that can deliver enough power to extend the life of your phone up to a total of 39 hours*. You’re free to make that call, send that pic, and listen to one more podcast episode.
Universal Wireless Charging 
The juice pack battery case is compatible with the mophie charge stream pad+ and other Qi wireless systems including those commonly found at airports, cafes, or any location where Qi wireless charging is available. In addition, the juice pack battery case maintains your phone's functionality while it charges. 
Low-Profile Design 
The slim, light-weight design of the juice pack battery case fits so comfortably in your hand, you’ll forget it has a built-in battery. You don’t have to sacrifice style and convenience for on-demand power. 
High-Impact Protection 
The powerful juice pack battery case provides additional protection for your phone with internal rubberized support pads that protect your phone from drops and falls and raised corners that help prevent scratched and cracked screens. 
Priority+ Charge & Sync 
Use the cable included with your phone to connect to a computer to recharge your juice pack battery. mophie Priority+ charging allows pass-through charge and sync while connected to a power source or computer. Your phone recharges first, and then the juice pack battery recharges itself. 
Check Your Status and Save Battery 
Turn the juice pack battery case on and off with the LED Status Indicator button, or momentarily press the button to display the battery levels or charge status.