I recently learned of this feature while Googling symptoms. My battery life has decreased dramatically in last 4 days. First time I figured maybe it wasn't plugged in at night like I thought it was. Nope, next fews days I checked battery percentage when waking up. I don't think it's software since there hasn't been any changes to that (just got the 11.4 notice a few minutes ago, have not installed yet). Anyways, If I got to settings>battery,>battery health (beta), my battery health is at 88% but still performing optimally. Just curious to see what you guys are seeing, and if it's under 100%, have you noticed a life span change? I wake up at 5:45am, and by the time I get home from work at 4:00pm, my battery has been 20-something% all week. This literally happened over night. Before this, it was 60-something% when I got home. Just curious if my battery is on it's last leg and getting ready to quit on me.