It will charge a 3000mAh phone battery 4 times And It will charge a 4000mAh phone battery 3 times Output: Double USB output 9V|2A, 18 Watts Fast Charge Body : Metal Frame |Weight : 430 grams Included in box: 1 Micro USB Cable, 1 User Manual and 1 Power Bank (Charger not included) Warranty : 6 months domestic warranty | For queries contact_us on: [ 18001036286 ] Time to Recharge - Approx 6.7 hours(18W- 9V/2A charger, standard USB cable) OR Approx 10 hours(10W- 5V/2A charger, standard USB cable) › See more product details Technical Details Brand Mi Manufacturer Xiaomi Model PB20IZM Model Name Mi Power Bank 20000mAh 2i Batteries 1 Lithium Polymer batteries required. Item model number PB20IZM Compatible Devices Compatible with all smartphones Mounting Hardware 1 Power Bank, 1 USB Cable & 1 User Manual Batteries Required No Battery Capacity 20000 Milliampere Hour (mAh) Battery Power Rating 2000 Unknown modifier Number of Ports 2 Material Acrylonitrile Butadiene Styrene Manufacturer Xiaomi Item Weight 430 g Product Dimensions 15.1 x 7.2 x 2.6 cm