Presence sensor: battery life

I was reading somewhere in the forum that SmartThings report battery life only at certain levels. 88% is the maximum. That doesn’t mean its at 88%. It could be more than 95% as well. Don’t know why it is that way. I am sorry if I am wrong. I will try to link to where I read it if I can find it.

Found one of them: SmartSense Motion Sensor Battery Life