Another tip: if you did not follow deanblue9's tip above (due to having to park on the street or you forgot about the power unlocking of the tailgate) and you have a battery charger/tender/maintainer...you can hook up to the jump start posts in the engine bay...or if you have one of those 9-volt battery maintainers that you insert into the cig lighter...this should supply enough power to electronically unlock the doors/tailgate (with the remote key, int/ext hatch release button, or the 45° door lock cylinder position) when the battery cables are disconnected. Just make sure that you shielded the battery cable ends so that they aren't touching each other or metal.
