When you put a bike into gear, it usually provides a little power and actually turns the wheel even though the clutch is fully in... This could be just pushing it over the limit of power the battery is giving out.
The manual should show you where the reg is located, if you can just visually check that out before the mechanic comes. Otherwise, a multimeter is only $20 :P and is a great thing to have in the long-run anyway.
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