From commercial point of view a battery is £14 cheaper than a complete back plate, sending a man with a ladder to a site costs a lot more than £14
replacing the battery in an oddessy means taking it down, taking it on the floor apart & refitting, should a new battery not clear the fault or the plastic clips break its would have been cheaper just to fit a new one.
Mine would be supplied with a new lid, if you paying money you might as well get something shiny in return