Originally Posted by Mudcat
How can it be charging the battery when there is no external electrical power?
There is only power to the mount when I turn on the ignition switch.
My Zumo rarely is removed from its cradle, only when I need to connect it to my home computer.
The power cord stays connected to the Mount, (cradle), all the time. When I remove the unit from my bike, I unplug the short power cord from the accessory port on my beak. Power cord, cradle, and Zumo are removed as one package and placed into a saddlebag or my room for the night.
Oh, ok, I see. I failed to realize that the power outlet you use was switched. Apologies. So yes, in that case there would be no draining.