DALLAS DS1220AB Non-volatile SRAM from 20 years ago --- reusable?
The batteries are not rechargeable and the modules are designed to be replaced when they fail, not recharged.

I know this because the modules are quite popular in old HP digitising oscilloscopes, of which I own one. After about 20 years the battery hits minimum voltage and calibration as well as some settings get reset back to defaults. I have heard of people having success with removing the battery from the package and replacing it, although I am not sure how well this would actually work. Applying a voltage to Vcc will not serve to charge the battery: this is because there is protection circuitry built into the module such that it does not recharge the non-rechargeable cell and damage the cell in the process.