External feed on doorbell

My Aqara doorbell is connected to an external power source but still I need to replace the back up batteries every ~6 months. What am I doing wrong?

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What’s the Voltage of the power source?

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Hi there, as this issue has already been resolved with our support team via email, we’ll be closing this topic on the forum as well. If you have any further questions or run into any other issues, please feel free to reply directly to our support email. Thanks for your support and understanding!