My understanding on disconnecting the batteries is that all the electrical equipment, while grounded to the frame, has the power through circuitry and fuses, but ends up at the power side of the battery. If you disconnect the battery, essentially, you’re breaking the circuit to the electronic equipment and thus, no harm should come to them from arrant current through the frame... but... that’s just my theory.
Thank you everyone for your replies.
I will disconnect the battery and keep my ground close.