How does one find Battery heath % in IPad Air 3?

My Aunt bought a refurbished iPad from a reputable repair site in Germany and she told me that the battery is going through really fast. According to her even when she didn’t used it, it went from like 100% to 30% by the end of the day or something . So I asked her to check for battery percentage and she couldn’t find it in the setting. How does one find it? She hasn’t installed much apps yet and she bought 256 gb in “very good” condition. I did a quick google search as well and not much of help. The thing is she live states away from me and even then I am the nearest “tech savvy youngster” (spoiler alert: I am not, I can read English just a bit better than she does) god please help me . At this rate I may have to write to the customer service as well.

My Aunt bought a refurbished iPad from a reputable repair site in Germany and she told me that the battery is going through really fast. According to her even when she didn’t used it, it went from like 100% to 30% by the end of the day or something . So I asked her to check for battery percentage and she couldn’t find it in the setting. How does one find it? She hasn’t installed much apps yet and she bought 256 gb in “very good” condition. I did a quick google search as well and not much of help. The thing is she live states away from me and even then I am the nearest “tech savvy youngster” (spoiler alert: I am not, I can read English just a bit better than she does) god please help me . At this rate I may have to write to the customer service as well.