Duracell Portable Power Bank Rechargeable Lithium-Ion Battery (2600 Mah) for iPhone, iPad, Samsung (Blue) Charge your mobile devices on the go, without an outlet Power bank utilizes an internal battery to store a charge from any standard wall outlet. Transfer this charge to your other electronic devices while you're on the go to keep them running longer. Charge and sync cables included. Built-in 2600mAh lithium-ion rechargeable battery. Average charging time of 2 hours.