You have two types of parts shown, the board is a Bally board, probably a pro series type, from a 5500 machine, that's my guess, somewhere there should be a Bally part number on the board.
the other board is a S plus motherboard, the unit with the plugs in the back is a S plus power distribution module, it contains the step down transformer,fuses and plugs to sent the power to different areas of the machine. the other unit is from a S plus machine, it is a first generation bill unit.
some of those items have a little value if they work and someone has a need. if the battery has leaked acid onto the board, its probably bad, if the Splus battery leaked acid onto the motherboard, its probably toast, the power module is heavy and probably worth the price of shipping, (never have seen one of these go bad) the first generation bill unit ?? I just threw six of those away last night (recycled them).
Hope this helps
Jim