Music keyboards (not working) (Welwyn Garden City, AL8)

Two children's electronic music keyboards, both not currently working. Brands are Chad Valley (red one) and Power Play (black one). Would anyone like either or both of them for an electrical repair project? Both are battery operated. The large black keyboard can also be connected to the mains - we have a power supply cord for it but are not sure if it's the correct one for it. Collection from AL8, Handside area.