Battery Power USB-C PD Power Supply

I’m not really sure where to start with this, so I’m starting here, and maybe someone can push me in the right direction. I’m trying to figure out how to create a device (or maybe one exists) that will allow me to use a battery such as an Anton Bauer 14.4v / 91WH battery with USB-C devices. So the input would be the battery and the output would be a USB-C female plug.

Anyone have any ideas?