Casio TR-4000 Translator and Calculator, for parts.

Vintage Casio TR-4000 electronic translator/calculator, sold for parts or repair. The battery compartment has visible corrosion on multiple contacts. I attempted to insert 357/303 button-cell batteries, but they do not remain securely seated. I have not confirmed whether these are the correct batteries. The unit has not been successfully powered on or functionally tested. The condition of the internal circuitry is unknown. Sold as pictured, with no guarantee of functionality. Suitable for restoration, repair, parts, or display.