Video Doorbell 2 - Hardwired but not chargin

Hi,I've had a video doorbell 2 for about 18 months and have gotten fed up with changing the batteries every couple of days so have hardwired it in.I'm getting 16VAC from the transformer that the doorbell is connected to (including the recommended resistor). My RSSI is -45.When I click on the app, the power source is "hardwired" and the power status shows as "very good". I have fully charged the battery and fitted it, however the battery is still draining about about 30% a day.My settings are:HDR: ONLive view: ONTap Camera Preview for Live View: ONVideo recording length: 90sSnapshot Capture: ONSnapshot Frequency: Every 5 MinutesMotion sensitivity: About 5% of the sliderPeople Only Mode: ONMotion Zone: Set just to cover the path / driveway to my front doorAdvanced Motion Detection: ONMotion schedule: Not setMotion Frequency: FrequentlyI'm usually getting around 8 to 12 motion / people detections a day.Should having the doorbell hardwired be able to sustain these settings?