The buzz/hum you describe is normal, particularly if the unit has a load on it, i.e. charging, running lights, etc. During the charge phase, the buzz will dissipate as the charge increases. Running light, it will remain constant, unless more load is introduced (turn the model lamps on and off, and you will see what i mean).
As for the low state of the battery, was the VII turned off while stored, particularly after the top off charge? Was teh charge cable left in teh unit while stored? Did you by chance note the LED sequences while charging?
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