Heat to İpad

I have a ipad 4 and I left it in my bag .I am using a smart case .I didnt realize that the cover slided and ipad was open and it stayed approx.5 hours and the charge level dropped from 100 % to 46% .And When I got it out of my bag I felt heat.Do you think any damage occurred to my ipad? İt is working normally and there was no warning for heat.