The best measure to determine whether the iPad is hot or not doesn't require rocket science. Not much of personal sense of feel. Instead, it's how the battery reacts to the device's heat.
- According to Apple, the iPads' battery temperature treshold is 32° to 95° F. That’s 0° to 35° C.
- In the case of iDevices, environmental temperature=operating temperature because of a known fact that in Apple designs, they've stripped out the plastic made protective shield of the battery, thus decreasing the battery's heat resistance.
(In my course of landing with the current 3rd iPad, I was told by an AppleCare consultant that iPads that operate over 34.6°, they qualify for exchanges. no second word)
- Make sure a full discharge is conducted
- Fully charge the iPad without using it
- Remove all iPad cases
- Use the iPad at normal conditions, probably keep brightness at 75% at most. Now run applications like games that are not retina supported. Then, include games like Real Racing2 HD (a Retina game) in your test.
- Measure both results using...
- An infrared thermometer/ thermal scanner to pick the heat numbers from the back of the iPad, especially the lower left corner beside the home button.
- If heat is proven to be above, especially way above 35celcius. The message is glaring at you; the iPad is producing more heat than what it can take, its a manufacturing defect.
- Go get an exchange if the heat is indeed over 35 celicius or 95f