Hello,
I am having issues with my Aqara doorbell G4. I have the doorbell connected to an external power supply, with an adaptor that outputs 25V AC 500mA. When I try to set up the doorbell in the Aqara app, I get an error message saying the battery is critically low and I should replace it. For some reason the device does not switch to external power supply mode. I have tried using a different adaptor but this gave the same issues.
Thanks in advance for your help!
Hi, mine is the same! Can’t seem to mute it? Regards
Hi, for the G4 Aqara recommends this 12V-24V AC 0.2A 50/60Hz 8V-24V DC 0.5A for a power supply
Maybe the G4 is so sensitive and 25V are already too much
Hello, Chris, it can’t be, it’s definitely too much voltage
Thanks for clarifying @gafich10 
Sorry, the 25V was a typo. My power supply is actually 24V, so it should be okay?
Should be , can you send a pic of the specifications of the power unit?
Hi, @Aqara_PM_Donie, can you recommend something on how to act in this situation?
The power specification of 25V AC 500mA does not seem to have any problem for the G4 doorbell to work with, because the power range of the doorbell is designed with some redundancy. However, under normal circumstances, when using a wired power supply, the battery level should be displayed as 100%. The battery level is low and only occurs when the input voltage is below 3.2-3.3V. I think there are two possible reasons for this issue. Firstly, the actual power specification of the transformer is too low. Secondly, the doorbell has hardware damage, you can remove the external wired power supply to use battery power to check whether the doorbell is working normal.
Seems the power supply should work - can you try the steps that Donie mentioned above?
Thanks for the replies!
I used the doorbell with batteries (without wired power supply) for a while, before trying the wired connection. The batteries would go from full to empty every time within a few days. That is why I wanted to switch to a wired power supply. Could this be an indication that there is hardware damage to the doorbell?
That’s difficult to answer… there are lots of circumstances which could increase the lifetime of batteries- also the type of battery is important to know- but there is already a thread open about G4 /G410 and battery types and usage
Hello, the main question. Did you remove the batteries and then connect the power supply? Do you have both the batteries and the power supply working at the same time?
It finally works! I added new batteries to the doorbell before connecting the power supply and now it works. I swear I tried this before, and it didn’t work then. Maybe those batteries were busted. Anyway, the problem is now solved.
Thanks so much for the help!
No, the problem is not solved. You should understand that the power supply and batteries may not work in parallel. If the batteries are bad (low voltage), the power supply may short (voltage drop) which in turn will cause the bell to malfunction. Consider this option for the future.
