2600mAh Built-in lithium battery Portable USB Power Bank External Battery Charger (Dark Blue(Cylinder)) 2600mAh USB Power Bank Portable External Battery Pack for iPhone PSP iPod 3DS Portable charger for mobile phone. 2600mAh Lithium-polymer Battery. Cute Candy Color Power Bank If there is any question, please feel free to contact our service department. Our pleasure to serve you.