Hopefully this won't ruffle any feathers with the current legal situation, but I just switched to Redvolts so I'm getting rid of my V-lock battery system.
So up for sale is my x QuickBack, battery back, and Switronix V-mount battery plate for Epic/Scarlet. It's a nice little system, and with various accessories (Red's accessory V-mount, Wooden's A-lock etc.) it can be mounted anywhere. I use one of those to mount it to the back pad on my Clutch for balance reasons, and it works fantastic.
The battery plate is the Switronix one that passes RED battery info if you're using the right kind of bricks.
All of it is in good shape with normal wear for being lightly used (only a few days of commercial shooting).
New you'd be looking at $600, I'm selling it for $475 shipped and paypalled in the USA. Outside the USA shipping is additional (sorry, but it's not cheap).
USA buyers if you wanted to buy my single brick and charger as well let me know.
PM me if you're interested.