Question CyberPower CP1500EPFCLCD behaves badly (despite new batteries)

Jul 19, 2021
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Hello everyone. I would appreciate it if someone could help me understand what is wrong with this UPS.

It's been working perfectly fine for the last 3 years and now it's started to act up. It shows 100% charge and then jumps to low values when switched to backup.
I thought maybe it's because of the old batteries. I just replaced them with a pair of CSB HRL 1234W but it's all the same.
I did a self-test in PowerPanel and it says "Passed", so it can't detect something is off.

I have recorded the video of its behavior and marked important events.
Please can you watch it and share your thoughts? Thank you!!
View: https://www.youtube.com/watch?v=VqkFQcTQrVw
 

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