Maintenance adds:
Just because you are at the hotel doesn't mean the airplane is still "BATT" off as you left it. At a maintenace base, when maintenance gets to the airplane they power it up and it is likely to stay powered up all night long. We do not power down and power up every time we walk away from the plane to work on another, get parts, take a break etc. Conceivably the airplane is powered up for the entire duration of the overnight visit. Do the math, that is probobly more clock time than it got during its flight day. Did you also know that most airplanes in heavy maintenance are powered up for the entire duration of the C or D check. They will be powered down for the occaisional fuel tank opening or such event, but 24/7 times 15 to 45 days power applied. Solenoids will fail/freeze/magnetic pole shift/etc over years and years of this.
MaintenanceController