The RavPower battery has a capacity of 10050mAh, with high durability against dust, water and shock, and it has an IP66 standard for resistance to water, dust and shock. iSmart technology gives every device the power it needs. It has two 2.4A iSmart ports with an output power of 3.4 (maximum power per port is 2.4A). You can charge your phone 3-4 times (depends on the battery size of your device).