A fully charged 5,000mAh power bank should charge an iPhone once from zero to full charge, before needing to be recharged itself. It should charge most modern Android phones from zero to around 85%. This is an economical option, which wont take up too much space in your bag, while having ample surface space to brand your company logo or message. 9.8 ( l ) x 6.3 ( w ) x 1.4 ( h ) cm ABS lithium polymer battery capacity: 5,000mAh 2 x USB A, 1 x Micro USB & 1 x Type C port Micro USB and Type C inputs: 10W (max): 5V/2A USB A and Type C outputs: 10W (max): 5V/2A LED indicator includes USB to Type C charging cable packaged in an Altitude kraft gift box