I do have a quick question:
With say NIMH batteries (say 8.4v), fully charged they will show 9.5v (say) on the multimeter. This will burn off under 9 soon enough. Even a fresh 9v alkaline cell will report 9.2 - 9.5v unloaded fresh out of the box.
How literally are we to take the rule "no point in the circuit must exceed 9v"? Are we supposed to make sure all batteries are discharged down to this to make sure we don't get hit up on impound/review?
Rule 4. h. says that voltage must not exceed 9V as labeled, so that's as literally as the rule should be interpreted.