@HunterK916 

When the doorbell is in Always-On Mode, power consumption is higher compared to when Always-On Mode is disabled. In this mode, when abnormal power loss is detected, the doorbell will automatically exit Always-On mode to ensure sustained operation. This mechanism will be triggered when the doorbell's battery level is below 70% and has decreased by more than 5% since then. 

In most cases, the abnormal power loss is caused by an unstable power supply. When the power supply is stable, the doorbell can maintain normal operation even in heavy usage.

For unstable power supply cases, it is important to verify whether the transformer you are using meets the doorbell's power requirements. If the transformer does meet the requirements, use a multimeter to check the voltage between the doorbell's connection points when the issue arises. If the voltage also remains within the normal range: 8-24V AC, then we should consider whether it is a compatibility issue. Try to use a different transformer if you have one.

If the situation remains the same, we recommend replacing a new doorbell. If the new doorbell also experiences the same issue with the same transformer, please email support.usa@tp-link.com for further assistance. 

To receive efficient assistance, make sure to include the following information in your email:

1. Detailed description of the problem you've encountered, and relevant screenshots.

2. Model of the transformer you used. 

3. Troubleshooting steps you've tried and the results. For example, the voltage test results when the doorbell switches to battery mode.

Jak123 wrote

  @Wayne-TP I am having this issue with my d225. Sadly this is a replacement for my other d225 that essentially was hallucinating events all night. I never had this power issue with my origional d255, but the replacement just had this issue after 5 days installed. It somehow used 36% of the battery today and exited always on mode. Its been a few hours and the battery is still at 64% and doesn't look to be charging even though the icon shows it should be. 

  @Jak123 

When Always‑On mode is off, the doorbell charges slower than when it’s on. If it’s still working and using power, the battery might not go up, or could even go down, which is normal.

For fast battery drain, you may refer this article for troubleshooting. What to do if the battery drains quickly on my Tapo battery-powered camera/doorbell?