09-01-2015, 10:32 AM
Your battery is probably fine, your phone most likely froze. The fact that it was warm, but unresponsive points to that...
If it happens again, hold down the sleep/wake button and the home button for ten seconds and then release them to force it off. Then hold the sleep/wake button for 3 seconds to turn it back on.
If it happens again, hold down the sleep/wake button and the home button for ten seconds and then release them to force it off. Then hold the sleep/wake button for 3 seconds to turn it back on.