Can I power my weather station (ISS) with an AC power source? - (FAQ)
I do not want to replace may batteries, can I power the outside portion (ISS) of the Vantage Pro 2 some other way?
Yes, you can purchase a power supply (same model as used for the console -6625 https://www.davisinstruments.com/product/power-adapter-for-vantage-family-consoles/)
You would unplug the solar and remove the battery. Then plug the power adapter into port 2 below.(Note, it will appear to seat only partially, this is actually fully seated)