Actually, I'm not sure. It might have been part of a bracelet or necklace at one time (it has connectors on each side of it). It has initials engraved on the front of it. It is silver, hollow inside, but does not open.
Great job. Please respect the dead. There's a reason he's not a USABLE battery. Look at his name and age. Apparently he died 4 years ago based on his activity - 108 years old..