Description Introduction: This power bank case is made for someone who need use your iphone all the time,becasue the original iphone battery can''t support a long working time,so people need charger your iphone everytime.This item can help you to extend the working time,and it design in mobile phone case,so it is very portable and also safe a money for a case. Features: 1. Smart Battery (Optimized to lengthen your Phone performance time; No more out of power dilemma during important phone conversations) 2. Full Body Coverage for samsung galaxy s8 s8plus 3. Light weight, thin design (Low profile) 4. Non slip comfort grip 5. USB charging and Sync without the need to disconnect your iPhone from the case 6. Automatic tests function 7. High-quality Li-polymer Cellphone battery 8. Extended battery pack capacity - 5000-5500mAh samsung galaxy s8 s8plus 9. ON/OFF Button for Optional Power Output Control 10. Sleek, Low-Profile design; Rechargeable up to 1000 times Specifications: Capacity: 5000-5500mAh for samsung galaxy s8 s8plus Input: DC 5V/800mA/Lightning Output: DC 5V/500mA/lighting Charging time: 6 hours Standby time: up to 300 hours Talk time: up to 6 hours on 3G/up to 12 hours on 2G Internet Use: up to 4.5 hours on 3G/up to 7 hours on Wi-Fi Audio play: up to 25 hours Video play: up to 9 hours Net Weight: 180g Package included: 1 x External Backup Battery Case Power Charger For samsung galaxy s8 s8plus