The Battery Dimmer is a DC to DC converter. It can take any input between 12 and 35V DC and it will convert into 24V DC in constant current, which is what the SL1 Switch runs on.
It welcomes any battery sources through V-lock/Anton Bauer or XLR 3 and 4 pin and has an inbuilt dimmer which can control brightness and color change.
Just like the DMX Power Box, another great feature, is that it quick-mounts onto the back of the light, which makes it very versatile. It comes with a shoulder strap too.