LifeBox 2600mAh Portable Powerbank USB External Backup Battery and Portable Charger (Blue) Whats power bank?Power bank serve as an extra battery or external charger for your phone or other electronic devices. Whats the different between branded power bank and generic power bank? Branded power bank mostly sell in REAL CAPACITY. How long does it take to charge a Power Bank 2600 mAh?The Power Bank 2600mAh charge will recharge in about 2-3 hours from a 1 amp power source Portable and Space Saving Safe & Easy to Use Real Capacity: 2600mAh (Li-ion) Sumsung Battery (INTERNAL) : Input: 5V DC 800mA Output: 5V DC 800mA