PowerGen PGMPP13000 13000mAh External Battery Pack High Capacity Power Bank Charger Dual USB output for phones, tablet, ipod Ultra High Capacity, 13000mAh, extend 80 hours of talk time or 40 hours of video play back time for iPhone 4. Compact, portable and stylish Design. Convenient to carry in your pocket or purse. Leave it plugged in to your phone. Grade A Lithium-polymer cells used ensures reliability; 500 + recharge cycles over the life of the battery Rechargeable: Convenient rechargeable battery allowing you to always have a battery charging backup when you are away from a AC outlet NO AC adapter is included. The PowerGen Battery Pack is compatible with most USB chargers come with your Cell phone or tablets.