I can highly recommend the XTPower 15600/20000 series. Those are powerbanks with integrated DC ‘barrel socket/plug’ output and adjustable voltage (9/12/16.5/19/24V). The big advantage here next to the required cables / adapters being already included, is the sufficient Ampere headroom to drive almost any DJ or producing hardware.
Mere cable adapters like the one shown above, especially the USB-A Ripcord ones, should be used with caution, as the conversion losses are quite high. For example, the Ripcord 12V and 19V models can only push 12W maximum, while the XTPower manages 50W constant / 65W peak.
By the way: SC Live / Mixstream with integrated speakers + powerbank = ultimate portability 
