Is it normal for my ups to make random clicking noises while operating?

I recently built a pc, and I want to make sure it's protected against power outages. I set it up to my pc, and it makes random clicking noises. I have no idea how frequent. Like once every 25-20 mins I'd say. Is that normal? I'm afraid it's messing up my pc some how.

Is it normal for my ups to make random clicking noises while operating?
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