Upgrading from the Nest doorbell battery to the wired 2nd gen is worth it : r/Nest
Amazon.com: Google Nest Doorbell (Wired) - Formerly Hello Video Doorbell with 24/7 Streaming - Smart Doorbell Camera for Home with HDR Video, HD Talk and Listen, Night Vision, and Person Alerts :
A Relay for the Nest Hello Doorbell - Functional Devices, Inc.