Just a quick update on this; TP-Link offered an RMA for the device, though I unplugged it, charged it to 100% (USB-C) and reconnected it to the newer 1A power supply and it has stayed at 100% charge...

@origamicrane Thanks, I emailed their Australian support and got an AI troubleshooting response back. Hopefully I'll hear back from them directly and receive a replacement if the issue. Heard a lot...

A few hours later, and I have received the notification: Battery Draining Too Fast "Doorbell": The battery has drained 5% in the past 4 hour(s). It appears to have gone from 66% to 61% in 2-3 hours...

I have recently purchased the Tapo D235 from Amazon in Australia, and the hardwired/Always on mode has also been giving me some grief. Originally installed it with this transformer from Amazon: 24V...