I have a 6 years old Acer laptop with i2760 processor and 640m graphic card.  Is it worth to repair and add ssd?

Condition of the laptop pretty bad
>battery totally dead
>very fast overheat then shutdown
>can't connect to Wi-Fi anymore. If by lan cable after overhead also dead
>loading damn slow. This one probably can be overcome by replacing the old 1tb hdd with maybe 480gb ssd