Sephiroth1089, the batteries I used to light up my PG Wing Gundam Custom are: Energizer 357 type batteries.
They are the exact equivalent to: LR44, 303, A76, AG13, EPX76, LR1154, and SR44SW/W, etc.
Looking at my model again, there are 2 LEDs that must be connected: the eyes and chest. Again...