I haven't looked at it before.
Apparently if I enable analytics I will get a report saying how many cycles my batter has lasted. Unless I use my phone for several hours of playing spotify and youtube I don't notice the battery dying during the day.
Right before I sold that SE to my friend I checked the battery health, and it was in the high 80s. Yet I could not get a full day's use on a single charge. This led me to conclude that that Battery Health measurement was bullshit.