DELTA POWERLITE LANTERN restoration (flashlight)

50's - 60's flashlight. covered in battery acid corrosion and rusted shut. i try polishing vintage plastic lens. and bringing it back to life. no battery to test with however. delta electric company, Marion, Indiana. UPDATE 9/18 I GOT A BATTERY TO TEST IT, HERES THE VID:    • I buy a 6v battery to finally test vintage...