DescriptionAs we know, The Raspberry Pi has 4 USB Port so that we can hook up 4 USB devices on it. You will need a USB expansion device like USB HUB If you want to have more USB device connected.
And most of them are not for mobility. Pi Supply & USB HUB is fit for your mobility requirement, It is smaller and functional.
It can provide power charging for your Cellphone (except iPhone) / Raspberry Pi 3 Model B/ Pi 2B /Pi B+ /Pi A+/Pi B/ Pi zero
It can offer you 4 USB-DATA transport Ports in case you need a USB HUB as well.

Features: ParametersValue Battery Capacity: 3800mAh; Maximum Output Current:2.0A; Output Voltage:5.0V; Output Ports: USB2.0 x 5; Standard Charging Current / Voltage: 1.0A/5.0V; USB Data Ports: USB 2.0 x 4 / Micro USB x1