Sorry to hear about your Nest thermostat and also for the delayed response. I want to check on this further.
A few questions — what type of Nest thermostat is this? Are you getting a specific message or code on the display of your thermostat? Also, has this worked with your HVAC system before?
You might also need to charge the display using a USB cable. To do this, pull off the thermostat display and use the USB port on the back to charge it with a USB cable and wall charger. Depending on the model you have, it'll be either mini or micro USB.
Keep me posted.
I'm sorry to hear you're having issues with your thermostat that won't hold its charge. I'd be happy to take a look at this for you.
Could you please share with us the power readings on your thermostat? You can view them in its Technical Info settings. Also, is there a C-wire connected to its base?
I'll look forward to your response.
@Akadonnajean, I'm dropping by to ensure that everything is covered here. How's it going with your Nest Thermostat? We would appreciate it if you could share the information we're asking above. We'd be glad to hear from you.
I appreciate the help, Mark.