BMW R1200RT/R1250RT Forum

I'm trying to decide if my Aux battery is useful or is just a lump of dead weight near the top of the bike.

Interested to hear from other RT-P owners on whether you run anything off your Aux battery (either directly or from the Hella socket at the back of the seat).

Not yet. I'm still working out the electrical circuits on mine. When it was decomm'd, they just clipped a lot of wires, and I'm trying to see what can be removed versus used.
I'd like to use it if possible. I really don't need a little storage compartment.