There is no battery update in the 1.4 firmware so your battery won't update. 1.4 AirCraft firmware flies fine with battery FW 1.6 and below. If you want to update the battery FW to 1.6 while leaving the AC @ 1.4 you'll need to plug the battery in to unit with 1.6 AC FW installed.
I'm just referring to the battery that says it requires an update. Or, if the Phantom came with firmware 1.4, would the battery be the same and I should leave it alone?