To clarify for others who are trying to follow you here, Are you talking about a single 1/4" TRS insert jack with a 1/4" TRS plug shorted TIP to RING???
Sorry, the word was "cabs" instead of "boxes". The patch cable is for the simple 2-hole, separate, send and return.I think he might be talking about a TRS shorted tip to ring, although it's not common on musical instrument amps to see FX send / return on the same jack.
The shorted 1/4" is wired groud-tip, mainly for my cabs that use TS female jack as a insert for wiring extra cab in series (to get the ohmage up).
The tip-ring shorted plug is useful for those single hole insert points (that mixers and my home practice combo have), that is a good reminder.
@NightTrain so glad to hear that it's the battery only