Where to connect the backup battery charger

[Never_Fade]

We have a question about the backup battery charger (Found here).

We are curious if we are supposed to connect the 12v in(of the charger) before the master breaker, or after the master breaker.

http://picasaweb.google.com/KE7CKI/Robotics/photo#5156166962017891010
We have it hooked up on this side. Can we hook it up here?

We currently have the 12v in connected after the master breaker (on the 20/30 fuse panel), the 'backup battery input on RC unit' connected to the battery input on the RC, and 'backup battery' label on the diagram connected to the backup battery.

Our situation occurs here. When we do not have the main 12v battery powered up, the 7.5v backup powers the system, through its connection on the 20/30 fuse panel.

If we were to connect the battery charger in the line before the master breaker, the 12v battery could be in -charging our 7.5 backup- while the breaker was restricting power to the rest of the robot. We are under the impression that this is illegal because that means that there is power running while the breaker is off (which defeats it's purpose, in a sense).