What is the real battery status for my Aqara Wireless Mini Switch T1?

I keep getting notifications that one of my Aqara Wireless Mini Switch T1 are low on battery. When I go to check it in the app, sometimes it is really low, and other times, it is at 100 %. As you can see in the pictures, it keeps swinging up and down. It is the same with all of my switches, but the graphs aren’t all alike.

So what is the real battery status?

Might be a question you could ask in the topic of the Aqara app you use.

Maybe a shitty battery, have you tried an other one?