Mili Power Prince 5000 mAh External Battery Pack for iPhone/iPad/Smartphones Battery capacity 5000 mAh Input: 12V/2A , Output: 9-12V/2A, 5V/2.1A Internet up to 33 hours of extra surfing time Talk time up to 42 hours of extra talk time Charging time: ~3 hours , Dimension: 4.80 in x 2.56 in x 0.59 in