Ralf:

I also have the A/C compressor option that required me to move the battery.  I looked at mounting it above the turbo controller but was afraid of cooking the battery so I just moved  it to the  luggage compartment.

I also moved the master relay and mounted it right on the battery box.  I did considered fusing the longer battery cable but decided against it.  I think that Honda tried a battery fuse years ago with poor results.  Anyway, no problems so far.

Regards, Bill Hogarty