The battery that keeps the memory healthy lasts for many years in normal use so you are probably okay for a few months if it is not a really old machine. Also you may have all the Parameters and Settings on a floppy or usb drive that came with the machine; there is a holder inside the control cabinet door that the floppy is normally in.
One thing to remember when you do get the machine powered up is to run the Run-In program to purge all the oil that will have drained down into the lower spindle bearing; this program should be in the machine. For the Run-In program you adjust the air pressure for the spindle lube to 30 psi and keep checking that the spindle nose is not getting warm while the program is running.
An open mind is a virtue...so long as all the common sense has not leaked out.