Parkside 12v Circular Saw **parts (Saltford)

An old Parkside Cordless Circular Saw, model "PHKSA 12 A1"

Battery works but doesn't last as long as it used to
Battery charger works fine.
Motor makes a noise like spinning but doesn't appear to 'engage' so blade doesn't spin.
All parts in original carry case

If someone can either repair it use for spares would be great??

Please only message if you are serious about collecting. Let me know a time a day.

Thanks for looking.