Did have a Zumo 350LM connected to the CAN-BUS on board power supply on my F700GS. Had to get the bike recovered back to the dealers as I had a flat battery after not using the bike for 9 days. Wollaston BMW discovered that even with the ignition switched off the power supply to the sat nav is still on and will drain the battery. They have now connected the sat nav directly to the battery solving the problem. Wollaston have told me that this has happened to several other customers bikes all fitted with the Zumo 350 and connected to the CAN-BUS.