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Thanks for your message – This is Steve from the support team.
You should wire a DC power cord to the closed outlet for continuous powering the camera. You also can choose the battery but you may need to recharge the battery constantly. We have tested this battery which can supply power for the camera 40-45 hours around. https://www.amazon.com/dp/B078T7M9HZ/
Except for power sources, I would like you to check the WiFi coverage around your nest box and make sure it is strong. Otherwise you can use a PLC adaptor to extend your WiFi coverage. Here is the guide to test the WiFi signal (https://green-backyard.com/pages/check-the-signal-before-setup-a-wifi-bird-box-camera/)
If you have any questions, please don’t hesitate to let me know. I will be happy to assist you.