Scosche IPDBAT2 Portable Charger and Backup Battery for Scosche goBAT II iPhone iPad 5000mAh - Original OEM - Retail Packaging - Black Battery Type: 3.7v - 50000mA Lithium polymer Output: 5v -5000mAh Charge time: 6-8 hours Discharge duration: About 1 hour when using iPhone and iPad at the same time, 3 hours when using iPad only and 2.5 hours when using iPhone or other mobile devices The goBAT II is one of the most powerful and compact backup battery / portable charger in the market today.