Low battery alert

I am all of a suddenly getting low battery alerts every 40 minutes for one of my cameras and it will not turn off? It has been days. I have changed nothing. How can I stop this?

More info needed.

What camera is it?
Is it running on battery only? Is it mains powered with or without battery backup?
What is the charge level on the battery (if battery powered)?

You’re assuming we know what you have, but we don’t.