(Note: Compatible Samsung Galaxy s8 ONLY) Powerful 4500mAh Li-polymer rechargeable battery case can effectively provide 100%+ extra battery life for your Galaxy S8, which is equivalent to add 24 hours talk time or 16 hours web browsing time. 360° comprehensive bumper design and hard-shell backplate, the Trianium Atomic Pro Fast Charging Portable Charger protects your Galaxy S8 from scratches and other daily wear and tear, yet small and convenient enough to fit easily in your hand or in your pocket. Featuring Quick-charge sync-through technology, the battery case allows you to sync your computer without having to remove the case. Simultaneously charge your samsung S8 and battery case together with your original Samsung Stock type-c cable/adapter.