There are three ports in the Anker 313 powercore slim 10K. One output and two input ports.

Output ports:

Only one USB-A (bigger port).

Input ports: 

Two input ports, One is a traditional Micro USB port, and the other is a new USB-C port. 

The USB-C port of the Anker 313 Power Bank (PowerCore 10K) is just an input port to charge itself. So you cannot use the USB-C port to charge your other devices. 

Confusion & Explanation:

Confusion occurs when especially Apple device users use this powercore 313.

As you know, most of the new apple devices started in 2019 with iPhone 11 series. Apple uses a different version of wall charger/adaptor version for its devices with USB-C support except for the traditional USB-A. Details in the diagram below:

This is specially used in Apple Macbooks and in new iPads. 

But for the iPhone, the USB-C adaptor is the same just a difference of cable, which is USB-C to lightning cable. Shown in this picture (adaptor+cable):  

Confusion occurs when Apple device users start using Anker Powercore 313. As explained earlier, there is a USB-C port in this powerbank, as users already have USB-C to C and USB-C to lightning cables from their apple devices such as Macbook Air and iPhone 14. Whenever they try to plug in those cables with the USB-C Port to charge their devices, it won’t charge as explained earlier that this model’s USB-C port has only one function, which is to provide power or to charge the powerbank itself, it cannot provide output power to charge other devices. 

A picture is attached explaining the Anker 313 Powercore 10K slim ports. 

If you have any questions, please contact us for further assistance.