Hello, I’m Nathan, and I’ll be assisting you today. My livelihood depends on your positive feedback, so your satisfaction is my highest priority.
Sorry to hear you’re having trouble.
There is no battery in the base station, just in the handsets.
For resetting purposes, in this case, unplugging power and phone line to the main base station for 15 minutes is sufficient.
You don't need to remove the handset batteries.
Please try this, and let me know the results.
Please also let me know if you have any other phones other than the panasonic system.