Makerfocus 5 Port USB 2.0 Hub Power Supply Module with 3800mAh Lithium Battery for Raspberry Pi 3 Pi 2 Model B A+ Pi Zero
[Product Information]
There is a maker made a funny thing called "mobile pi" with this 0.91 Inch OLED Module and Pi supply & USB HUB, you can check it by accessing following link: https://www.instructables.com/id/My-Fantastic-MobilePi/.Please follow the link: [How to use it with Raspberry Pi 3B] https://www.youtube.com/watch?v=9D8N3BwYL4w
Battery Capacity: 3800mAh. Pi Supply USB HUB is fit for your mobility requirement, It is smaller and functional.
It can provide power charging for your Cellphone / Raspberry Pi 3 Model B/ Pi 2B /Pi B+ /Pi A+/Pi B/ Pi zero
You will need a USB expansion device like USB HUB If you want to have more USB device connected.
More detail to refer: http://wiki.52pi.com/index.php/Pi_Supply_%26_USB_HUB_SKU:_EP-0078