How to check the battery health of Apple ipad?

Because the iPad has never been healthy before, neither the new pad nor the old pad is as healthy as the battery. Only iPhone has battery health function, because iPad is bigger. You can use the computer to check the health of the battery. Because iPad products originally discussed the battery health function of products distributed in the form, this proposal was first put forward on 20 10. An insider of the company suggested that the proposal to add battery health function to ipad has all been rejected, because if the battery health function is added to pad, the battery of pad itself is a portable computer, which is relatively large and lasts much longer than that of iPhone, because iPad is? 4 batteries, and the iPhone only has? 1 battery, so this is also a reason why there is no battery health function.