there is no battery “health” status indicator on the iPad like there is on the iPhone.
What you have framed is a curve of the battery charge level over the last 24 hours, level expressed as a percentage. Below, you find the time of use of your iPad over the same period (the blue bars) and again below, there is an indication of the applications used and the share they have taken in the consumption of the battery. , expressed as a percentage. By pressing “Show activity”, it is expressed in hours, minutes, seconds. If you tap on a specific part of the battery level curve, you can see which app is using your battery the most at that moment.
Here’s what your screenshot says, if I understood everything correctly: your iPad was about 75% charged at 9 a.m., it was put in power saving mode, had been used a little until at 12 noon without changing the battery level too much, then used a lot between 12 and 3 p.m., which caused the battery to drop a lot, then paused, then it was put on charge around 4:30 p.m. and used a lot (not recommended because it can do heat your iPad), then break and then again used a lot between 11 p.m. and 3 a.m. You mainly used Safari, Youtube and LumiaFusion to a lesser extent.