Hello @Latishamarie
Thanks for reaching out to our Nest Community about your Nest thermostat battery. I apologize for all the inconvenience. I'm here to help you with it.
I suggest checking if the thermostat is detecting the wiring configuration. You can try to remove the wires, clean them, and reconnect to the base. If all seems correct, another solution is to perform a reset on the unit and set it up again.
Feel free to respond if you already tried these steps; I'm happy to find a solution for you.
Best regards,
Douglas.
