That's strange. There should be a label there called "Wear Level" under "Battery". But the interface of your Aida64 looks very different from mine - are you still in Windows Phone 8.1? I've upgraded mine to Windows 10 Mobile already, and the app versions might be different. My Aida64 is version 2.0.6.0.
I think the "module" that describes battery wear sends data in multiples of 5, so 5%, 10%, 15% - it's more affordable that way. So it's possible that your battery has between 5% and 0% wear, exclusive of 5%.