[Al Skierkiewicz]

Paul,
If you use the IFI charging circuit, then IFI makes it mandatory to use it as it is drawn with no mods. If the RC should fail and they determine the cause relates to backup battery it may void the warranty.

<R56> The 7.2v backup battery may be charged on or off the ROBOT. When off the ROBOT, the battery is to be charged with the provided 7.2V backup battery charger. When mounted on the ROBOT, the backup battery may be charged from the 12VDC primary battery by using the custom charging circuit available from Innovation First Inc.

There is no other provision beyond these two.