Not sure what kind of battery it has, I hope it's not over voltage to cause it to give wrong readings, but I have to try it out ot know.
My battery cheat-sheet (I keep a Google Doc to track these):
pen ft px-625 1.35v
pen s px-625 1.35v
35 sp px-625 1.35v
om-1 px-625 1.35v
om-2 epx-76 or v-76 or sr-44 silver oxide 1.5v x2
om-4 epx-76 or v-76 or sr-44 silver oxide 1.5v x2
nikon f3 epx-76 or v-76 or sr-44 silver oxide 1.5v x2
nikon fe epx-76 or v-76 or sr-44 silver oxide 1.5v x2
pentax k1000 epx-76 or v-76 or sr-44 silver oxide 1.5v
konica hexar af 2CR5 6v
sr = silver oxide = expensive/longer lasting
lr = lithium oxide = cheaper/doesn’t last as long
Note that the 625 cell was usually Mercury so difficult/impossible to source the original - plenty of alternatives available but can have a different power-curve. Its definitely worthwhile comparing the metering in an old camera with a digital equivalent (eg your digital camera or hand-held meter with the same aperture, shutter, iso values) as a cross-check to save frustration when you see the finished negs, prints or scans. If the battery or meter is off, you can usually use exposure compensation or just set the film-speed accordingly to allow for a different voltage.