This is the fourfold USB-C 100W charger in credit card size your're looking for.
Charge 2 HyperJuice USB-C PD 100 batteries at the same time.
There is no other USB-C ac power adapter on the market which is able to charge
your MacBook or USB-C battery with full 100W power.
Charge 4 devices at the same time. MacBook, iPad, iPhone and other devices.
Small and lightweight, a great charger for professional photographers travelling.
The HyperJuice USB-C 100 battery is coming without ac power adapter.
We highly recommend this USB C 100W charger to charge several of your USB-C
batteries at the same time.